diff --git a/frontend/src/components/Contributions/ContributionForm.spec.js b/frontend/src/components/Contributions/ContributionForm.spec.js
index 47ee4a763..626d5e062 100644
--- a/frontend/src/components/Contributions/ContributionForm.spec.js
+++ b/frontend/src/components/Contributions/ContributionForm.spec.js
@@ -4,13 +4,6 @@ import ContributionForm from './ContributionForm.vue'
 import { useForm } from 'vee-validate'
 
 // Mock external components and dependencies
-vi.mock('@/components/Inputs/InputHour', () => ({
-  default: {
-    name: 'InputHour',
-    template: '<input data-testid="input-hour" />',
-  },
-}))
-
 vi.mock('@/components/Inputs/InputAmount', () => ({
   default: {
     name: 'InputAmount',
@@ -54,8 +47,6 @@ describe('ContributionForm', () => {
       hours: 2,
       amount: 40,
     },
-    isThisMonth: true,
-    minimalDate: new Date('2024-01-01'),
     maxGddLastMonth: 100,
     maxGddThisMonth: 200,
   }
@@ -73,44 +64,81 @@ describe('ContributionForm', () => {
     expect(wrapper.find('.contribution-form').exists()).toBe(true)
   })
 
-  it('computes showMessage correctly', async () => {
-    expect(wrapper.vm.showMessage).toBe(false)
-
-    await wrapper.setProps({
-      maxGddThisMonth: 0,
-      maxGddLastMonth: 0,
+  describe('compute isThisMonth', () => {
+    it('return true', async () => {
+      await wrapper.setProps({
+        modelValue: { date: new Date().toISOString() },
+      })
+      expect(wrapper.vm.isThisMonth).toBe(true)
     })
+    it('return false', async () => {
+      const now = new Date()
+      const lastMonth = new Date(now.setMonth(now.getMonth() - 1, 1))
+      await wrapper.setProps({
+        modelValue: { date: lastMonth.toISOString() },
+      })
+      expect(wrapper.vm.isThisMonth).toBe(false)
+    })
+  })
 
-    expect(wrapper.vm.showMessage).toBe(true)
+  describe('noOpenCreations return correct translation key', () => {
+    it('if both max gdd are > 0', () => {
+      expect(wrapper.vm.noOpenCreation).toBeUndefined()
+    })
+    it('if max gdd for this month is 0, and form.date is in last month', async () => {
+      const now = new Date()
+      const lastMonth = new Date(now.setMonth(now.getMonth() - 1, 1))
+      await wrapper.setProps({
+        maxGddThisMonth: 0,
+        modelValue: { date: lastMonth.toISOString() },
+      })
+      expect(wrapper.vm.noOpenCreation).toBeUndefined()
+    })
+    it('if max gdd for last month is 0, and form.date is in this month', async () => {
+      await wrapper.setProps({
+        maxGddLastMonth: 0,
+        modelValue: { date: new Date().toISOString() },
+      })
+      expect(wrapper.vm.noOpenCreation).toBeUndefined()
+    })
+    it('if max gdd is 0 for both months', async () => {
+      await wrapper.setProps({
+        maxGddThisMonth: 0,
+        maxGddLastMonth: 0,
+      })
+      expect(wrapper.vm.noOpenCreation).toBe('contribution.noOpenCreation.allMonth')
+    })
+    it('if max gdd this month is zero and form.date is inside this month', async () => {
+      await wrapper.setProps({
+        maxGddThisMonth: 0,
+        modelValue: { date: new Date().toISOString() },
+      })
+      expect(wrapper.vm.noOpenCreation).toBe('contribution.noOpenCreation.thisMonth')
+    })
+    it('if max gdd last month is zero and form.date is inside last month', async () => {
+      const now = new Date()
+      const lastMonth = new Date(now.setMonth(now.getMonth() - 1, 1))
+      await wrapper.setProps({
+        maxGddLastMonth: 0,
+        modelValue: { date: lastMonth.toISOString() },
+      })
+      expect(wrapper.vm.noOpenCreation).toBe('contribution.noOpenCreation.lastMonth')
+    })
   })
 
   it('computes disabled correctly', async () => {
-    expect(wrapper.vm.disabled).toBe(false)
+    expect(wrapper.vm.disabled).toBe(true)
 
     await wrapper.setProps({
-      maxGddThisMonth: 30,
+      modelValue: { date: new Date().toISOString().slice(0, 10) },
     })
 
     wrapper.vm.form.amount = 100
 
-    expect(wrapper.vm.disabled).toBe(true)
-  })
-
-  it('computes validMaxGDD correctly', async () => {
-    expect(wrapper.vm.validMaxGDD).toBe(200)
-
-    await wrapper.setProps({ isThisMonth: false })
-
-    expect(wrapper.vm.validMaxGDD).toBe(100)
+    expect(wrapper.vm.disabled).toBe(false)
   })
 
   it('updates amount when hours change', async () => {
-    const setFieldValueMock = vi.fn()
-    vi.mocked(useForm).mockReturnValue({
-      ...vi.mocked(useForm)(),
-      setFieldValue: setFieldValueMock,
-    })
-
     wrapper = mount(ContributionForm, {
       props: defaultProps,
       global: {
@@ -121,9 +149,9 @@ describe('ContributionForm', () => {
     await wrapper.vm.$nextTick()
 
     // Simulate changing hours
-    wrapper.vm.updateAmount(3)
+    wrapper.vm.updateField(3, 'hours')
 
-    expect(setFieldValueMock).toHaveBeenCalledWith('amount', '60.00')
+    expect(wrapper.vm.form.amount).toBe('60.00')
   })
 
   it('emits update-contribution event on submit for existing contribution', async () => {
@@ -159,31 +187,4 @@ describe('ContributionForm', () => {
 
     expect(wrapper.emitted('set-contribution')).toBeTruthy()
   })
-
-  it('resets form on fullFormReset', () => {
-    const resetFormMock = vi.fn()
-    vi.mocked(useForm).mockReturnValue({
-      ...vi.mocked(useForm)(),
-      resetForm: resetFormMock,
-    })
-
-    wrapper = mount(ContributionForm, {
-      props: defaultProps,
-      global: {
-        stubs: ['BForm', 'BFormInput', 'BRow', 'BCol', 'BButton'],
-      },
-    })
-
-    wrapper.vm.fullFormReset()
-
-    expect(resetFormMock).toHaveBeenCalledWith({
-      values: {
-        id: null,
-        date: '',
-        memo: '',
-        hours: 0,
-        amount: '',
-      },
-    })
-  })
 })
diff --git a/frontend/src/components/Contributions/ContributionForm.vue b/frontend/src/components/Contributions/ContributionForm.vue
index 5612ae14b..19540c514 100644
--- a/frontend/src/components/Contributions/ContributionForm.vue
+++ b/frontend/src/components/Contributions/ContributionForm.vue
@@ -1,63 +1,55 @@
 <template>
   <div class="contribution-form">
     <BForm
-      ref="form"
       class="form-style p-3 bg-white app-box-shadow gradido-border-radius"
       @submit.prevent="submit"
     >
-      <label>{{ $t('contribution.selectDate') }}</label>
-      <BFormInput
+      <ValidatedInput
         id="contribution-date"
         :model-value="date"
-        :state="dataFieldMeta.valid"
-        :locale="$i18n.locale"
-        :max="getMaximalDate"
-        :min="minimalDate.toISOString().slice(0, 10)"
-        class="mb-4 bg-248"
-        reset-value=""
-        :label-no-date-selected="$t('contribution.noDateSelected')"
-        required
+        name="date"
+        :label="$t('contribution.selectDate')"
         :no-flip="true"
+        class="mb-4 bg-248"
         type="date"
-        @update:model-value="handleDateChange"
-      >
-        <template #nav-prev-year><span></span></template>
-        <template #nav-next-year><span></span></template>
-      </BFormInput>
-
-      <div v-if="showMessage" class="p-3" data-test="contribtion-message">
+        :rules="validationSchema.fields.date"
+        @update:model-value="updateField"
+      />
+      <div v-if="noOpenCreation" class="p-3" data-test="contribution-message">
         {{ noOpenCreation }}
       </div>
       <div v-else>
-        <input-textarea
+        <ValidatedInput
           id="contribution-memo"
+          :model-value="memo"
           name="memo"
           :label="$t('contribution.activity')"
           :placeholder="$t('contribution.yourActivity')"
-          :rules="{ required: true, min: 5, max: 255 }"
+          :rules="validationSchema.fields.memo"
+          textarea="true"
+          @update:model-value="updateField"
         />
-        <input-hour
+        <ValidatedInput
           name="hours"
+          :model-value="hours"
           :label="$t('form.hours')"
-          placeholder="0.25"
-          :rules="{
-            required: true,
-            min: 0.25,
-            max: validMaxTime,
-            gddCreationTime: { min: 0.25, max: validMaxTime },
-          }"
-          :valid-max-time="validMaxTime"
+          placeholder="0.01"
+          step="0.01"
+          type="number"
+          :rules="validationSchema.fields.hours"
+          @update:model-value="updateField"
         />
-        <input-amount
+        <LabeledInput
           id="contribution-amount"
+          :model-value="amount"
           class="mt-3"
           name="amount"
           :label="$t('form.amount')"
-          placeholder="20"
-          :rules="{ required: true, gddSendAmount: { min: 20, max: validMaxGDD } }"
-          typ="ContributionForm"
+          :placeholder="GDD_PER_HOUR"
+          readonly
+          type="text"
+          trim
         />
-
         <BRow class="mt-5">
           <BCol>
             <BButton
@@ -88,107 +80,104 @@
 </template>
 
 <script setup>
-import { ref, computed, watch, onMounted } from 'vue'
+import { reactive, computed, watch } from 'vue'
 import { useI18n } from 'vue-i18n'
-import InputHour from '@/components/Inputs/InputHour'
-import InputAmount from '@/components/Inputs/InputAmount'
-import InputTextarea from '@/components/Inputs/InputTextarea'
-import { useField, useForm } from 'vee-validate'
+import ValidatedInput from '@/components/Inputs/ValidatedInput'
+import LabeledInput from '@/components/Inputs/LabeledInput'
+import { memo as memoSchema } from '@/validationSchemas'
+import { object, date as dateSchema, number } from 'yup'
+import { GDD_PER_HOUR } from '../../constants'
 
 const props = defineProps({
   modelValue: { type: Object, required: true },
-  isThisMonth: { type: Boolean, required: true },
-  minimalDate: { type: Date, required: true },
   maxGddLastMonth: { type: Number, required: true },
   maxGddThisMonth: { type: Number, required: true },
 })
 
-const emit = defineEmits(['update-contribution', 'set-contribution'])
+const emit = defineEmits(['update-contribution', 'set-contribution', 'update:modelValue'])
 
 const { t } = useI18n()
 
-const form = ref({ ...props.modelValue })
+const form = reactive({ ...props.modelValue })
 
-const {
-  values: formValues,
-  meta: formMeta,
-  resetForm,
-  defineField,
-  setFieldValue,
-} = useForm({
-  initialValues: {
-    date: props.modelValue.date,
-    memo: props.modelValue.memo,
-    hours: props.modelValue.hours,
-    amount: props.modelValue.amount,
-  },
+// update local form if in parent form changed, it is necessary because the community page will reuse this form also for editing existing
+// contributions, and it will reusing a existing instance of this component
+watch(
+  () => props.modelValue,
+  (newValue) => Object.assign(form, newValue),
+)
+
+// use computed to make sure child input update if props from parent from this component change
+const amount = computed(() => form.amount)
+const date = computed(() => form.date)
+const hours = computed(() => form.hours)
+const memo = computed(() => form.memo)
+
+const isThisMonth = computed(() => {
+  const formDate = new Date(form.date)
+  const now = new Date()
+  return formDate.getMonth() === now.getMonth() && formDate.getFullYear() === now.getFullYear()
 })
 
-const [date, dateProps] = defineField('date')
-
-const { meta: dataFieldMeta } = useField('date', 'required')
-
-const handleDateChange = (newDate) => {
-  date.value = newDate
-  emit('update:model-value', { ...props.modelValue, date: newDate })
-}
-
-const showMessage = computed(() => {
-  if (props.maxGddThisMonth <= 0 && props.maxGddLastMonth <= 0) return true
-  if (props.modelValue.date)
-    return (
-      (props.isThisMonth && props.maxGddThisMonth <= 0) ||
-      (!props.isThisMonth && props.maxGddLastMonth <= 0)
-    )
-  return false
-})
-
-const disabled = computed(() => {
-  return (
-    !formMeta.value.valid ||
-    (props.isThisMonth && parseInt(form.value.amount) > parseInt(props.maxGddThisMonth)) ||
-    (!props.isThisMonth && parseInt(form.value.amount) > parseInt(props.maxGddLastMonth))
+// reactive validation schema, because some boundaries depend on form input and existing data
+const validationSchema = computed(() => {
+  const maxAmounts = Number(
+    isThisMonth.value ? parseFloat(props.maxGddThisMonth) : parseFloat(props.maxGddLastMonth),
   )
+  const maxHours = parseFloat(Number(maxAmounts / GDD_PER_HOUR).toFixed(2))
+
+  return object({
+    // The date field is required and needs to be a valid date
+    // contribution date
+    date: dateSchema()
+      .required()
+      .min(new Date(new Date().setMonth(new Date().getMonth() - 1, 1)).toISOString().slice(0, 10)) // min date is first day of last month
+      .max(new Date().toISOString().slice(0, 10))
+      .default(''), // date cannot be in the future
+    memo: memoSchema,
+    hours: number()
+      .required()
+      .transform((value, originalValue) => (originalValue === '' ? undefined : value))
+      .min(0.01, ({ min }) => ({ key: 'form.validation.gddCreationTime.min', values: { min } }))
+      .max(maxHours, ({ max }) => ({ key: 'form.validation.gddCreationTime.max', values: { max } }))
+      .test('decimal-places', 'form.validation.gddCreationTime.decimal-places', (value) => {
+        if (value === undefined || value === null) return true
+        return /^\d+(\.\d{0,2})?$/.test(value.toString())
+      }),
+    amount: number().min(0.01).max(maxAmounts),
+  })
 })
 
-const validMaxGDD = computed(() => {
-  return Number(props.isThisMonth ? props.maxGddThisMonth : props.maxGddLastMonth)
-})
-
-const validMaxTime = computed(() => {
-  return Number(validMaxGDD.value / 20)
-})
+const disabled = computed(() => !validationSchema.value.isValidSync(form))
 
 const noOpenCreation = computed(() => {
   if (props.maxGddThisMonth <= 0 && props.maxGddLastMonth <= 0) {
     return t('contribution.noOpenCreation.allMonth')
   }
-  if (props.isThisMonth && props.maxGddThisMonth <= 0) {
-    return t('contribution.noOpenCreation.thisMonth')
+  if (form.date) {
+    if (isThisMonth.value && props.maxGddThisMonth <= 0) {
+      return t('contribution.noOpenCreation.thisMonth')
+    }
+    if (!isThisMonth.value && props.maxGddLastMonth <= 0) {
+      return t('contribution.noOpenCreation.lastMonth')
+    }
   }
-  if (!props.isThisMonth && props.maxGddLastMonth <= 0) {
-    return t('contribution.noOpenCreation.lastMonth')
-  }
-  return ''
+  return undefined
 })
 
-const getMaximalDate = computed(() => {
-  return new Date().toISOString().slice(0, 10)
-})
-
-watch(
-  () => formValues.hours,
-  () => {
-    updateAmount(formValues.hours)
-  },
-)
-
-function updateAmount(hours) {
-  setFieldValue('amount', (hours * 20).toFixed(2).toString())
+const updateField = (newValue, name) => {
+  if (typeof name === 'string' && name.length) {
+    form[name] = newValue
+    if (name === 'hours') {
+      const amount = form.hours ? (form.hours * GDD_PER_HOUR).toFixed(2) : GDD_PER_HOUR
+      form.amount = amount.toString()
+    }
+  }
+  emit('update:modelValue', form)
 }
 
 function submit() {
-  const dataToSave = { ...formValues }
+  const dataToSave = { ...form }
   let emitOption = 'set-contribution'
   if (props.modelValue.id) {
     dataToSave.id = props.modelValue.id
@@ -199,14 +188,12 @@ function submit() {
 }
 
 function fullFormReset() {
-  resetForm({
-    values: {
-      id: null,
-      date: '',
-      memo: '',
-      hours: 0,
-      amount: '',
-    },
+  emit('update:modelValue', {
+    id: undefined,
+    date: null,
+    memo: '',
+    hours: '',
+    amount: undefined,
   })
 }
 </script>
diff --git a/frontend/src/components/Contributions/ContributionListItem.spec.js b/frontend/src/components/Contributions/ContributionListItem.spec.js
index 6140a9147..5abb1f8b6 100644
--- a/frontend/src/components/Contributions/ContributionListItem.spec.js
+++ b/frontend/src/components/Contributions/ContributionListItem.spec.js
@@ -99,12 +99,6 @@ describe('ContributionListItem', () => {
       })
     })
 
-    describe('date', () => {
-      it('is equal to createdAt', () => {
-        expect(wrapper.vm.date).toBe(wrapper.vm.createdAt)
-      })
-    })
-
     describe('delete contribution', () => {
       describe('edit contribution', () => {
         beforeEach(() => {
diff --git a/frontend/src/components/Contributions/ContributionListItem.vue b/frontend/src/components/Contributions/ContributionListItem.vue
index 87dffa6b3..a08af2e4c 100644
--- a/frontend/src/components/Contributions/ContributionListItem.vue
+++ b/frontend/src/components/Contributions/ContributionListItem.vue
@@ -48,7 +48,7 @@
         </BCol>
         <BCol cols="9" lg="3" offset="3" offset-md="0" offset-lg="0">
           <div class="small">
-            {{ $t('creation') }} {{ $t('(') }}{{ amount / 20 }} {{ $t('h') }}{{ $t(')') }}
+            {{ $t('creation') }} {{ $t('(') }}{{ hours }} {{ $t('h') }}{{ $t(')') }}
           </div>
           <div v-if="status === 'DENIED' && allContribution" class="fw-bold">
             <variant-icon icon="x-circle" variant="danger" />
@@ -125,8 +125,9 @@ import ContributionMessagesList from '@/components/ContributionMessages/Contribu
 import { listContributionMessages } from '@/graphql/queries'
 import { useAppToast } from '@/composables/useToast'
 import { useI18n } from 'vue-i18n'
-import { useLazyQuery, useQuery } from '@vue/apollo-composable'
+import { useLazyQuery } from '@vue/apollo-composable'
 import AppAvatar from '@/components/AppAvatar.vue'
+import { GDD_PER_HOUR } from '../../constants'
 
 const props = defineProps({
   id: {
@@ -201,10 +202,9 @@ const props = defineProps({
   },
 })
 
-const { toastError, toastSuccess } = useAppToast()
+const { toastError } = useAppToast()
 const { t } = useI18n()
 
-const inProcess = ref(true)
 const messagesGet = ref([])
 const visible = ref(false)
 
@@ -224,8 +224,6 @@ const icon = computed(() => {
   return 'bell-fill'
 })
 
-const date = computed(() => props.createdAt)
-
 const collapseId = computed(() => 'collapse' + String(props.id))
 
 const username = computed(() => ({
@@ -233,6 +231,8 @@ const username = computed(() => ({
   initials: `${props.firstName[0]}${props.lastName[0]}`,
 }))
 
+const hours = computed(() => parseFloat((props.amount / GDD_PER_HOUR).toFixed(2)))
+
 watch(
   () => visible.value,
   () => {
diff --git a/frontend/src/components/Contributions/OpenCreationsAmount.vue b/frontend/src/components/Contributions/OpenCreationsAmount.vue
index 3a0b6ea5a..2b15bdc52 100644
--- a/frontend/src/components/Contributions/OpenCreationsAmount.vue
+++ b/frontend/src/components/Contributions/OpenCreationsAmount.vue
@@ -32,29 +32,29 @@
     </div>
   </div>
 </template>
-<script>
-export default {
-  name: 'OpenCreationsAmount',
-  props: {
-    minimalDate: { type: Date, required: true },
-    maxGddLastMonth: { type: Number, required: true },
-    maxGddThisMonth: { type: Number, required: true },
-  },
-  computed: {
-    hoursSubmittedThisMonth() {
-      return (1000 - this.maxGddThisMonth) / 20
-    },
-    hoursSubmittedLastMonth() {
-      return (1000 - this.maxGddLastMonth) / 20
-    },
-    hoursAvailableThisMonth() {
-      return this.maxGddThisMonth / 20
-    },
-    hoursAvailableLastMonth() {
-      return this.maxGddLastMonth / 20
-    },
-  },
+
+<script setup>
+import { computed } from 'vue'
+import { GDD_PER_HOUR } from '../../constants'
+
+const props = defineProps({
+  minimalDate: { type: Date, required: true },
+  maxGddLastMonth: { type: Number, required: true },
+  maxGddThisMonth: { type: Number, required: true },
+})
+
+function afterComma(input) {
+  return parseFloat(input.toFixed(2)).toString()
 }
+
+const hoursSubmittedThisMonth = computed(() =>
+  afterComma((1000 - props.maxGddThisMonth) / GDD_PER_HOUR),
+)
+const hoursSubmittedLastMonth = computed(() =>
+  afterComma((1000 - props.maxGddLastMonth) / GDD_PER_HOUR),
+)
+const hoursAvailableThisMonth = computed(() => afterComma(props.maxGddThisMonth / GDD_PER_HOUR))
+const hoursAvailableLastMonth = computed(() => afterComma(props.maxGddLastMonth / GDD_PER_HOUR))
 </script>
 
 <style lang="scss" scoped>
diff --git a/frontend/src/components/Inputs/InputHour.spec.js b/frontend/src/components/Inputs/InputHour.spec.js
deleted file mode 100644
index f2f127601..000000000
--- a/frontend/src/components/Inputs/InputHour.spec.js
+++ /dev/null
@@ -1,108 +0,0 @@
-import { mount } from '@vue/test-utils'
-import { describe, it, expect, beforeEach, vi } from 'vitest'
-import { ref } from 'vue'
-import InputHour from './InputHour.vue'
-import { useField } from 'vee-validate'
-import { BFormGroup, BFormInput, BFormInvalidFeedback } from 'bootstrap-vue-next'
-
-// Mock vee-validate
-vi.mock('vee-validate', () => ({
-  useField: vi.fn(),
-}))
-
-describe('InputHour', () => {
-  let wrapper
-
-  const createWrapper = (propsData = {}) => {
-    return mount(InputHour, {
-      props: {
-        rules: {},
-        name: 'input-field-name',
-        label: 'input-field-label',
-        placeholder: 'input-field-placeholder',
-        validMaxTime: 25,
-        ...propsData,
-      },
-      global: {
-        components: {
-          BFormGroup,
-          BFormInput,
-          BFormInvalidFeedback,
-        },
-        mocks: {
-          $t: (t) => t,
-          $i18n: {
-            locale: () => 'en',
-          },
-          $n: (n) => String(n),
-          $route: {
-            params: {},
-          },
-        },
-      },
-    })
-  }
-
-  beforeEach(() => {
-    useField.mockReturnValue({
-      value: ref(0),
-      errorMessage: ref(''),
-      meta: ref({ valid: true }),
-    })
-    wrapper = createWrapper()
-  })
-
-  it('renders the component input-hour', () => {
-    expect(wrapper.find('div.input-hour').exists()).toBe(true)
-  })
-
-  it('has an input field', () => {
-    expect(wrapper.findComponent({ name: 'BFormInput' }).exists()).toBe(true)
-  })
-
-  describe('properties', () => {
-    it('passes correct props to BFormInput', () => {
-      const input = wrapper.findComponent({ name: 'BFormInput' })
-      expect(input.props()).toMatchObject({
-        id: 'input-field-name-input-field',
-        modelValue: 0,
-        name: 'input-field-name',
-        placeholder: 'input-field-placeholder',
-        type: 'number',
-        state: true,
-        step: '0.25',
-        min: '0',
-        max: 25,
-      })
-    })
-
-    it('passes correct props to BFormGroup', () => {
-      const formGroup = wrapper.findComponent({ name: 'BFormGroup' })
-      expect(formGroup.props()).toMatchObject({
-        label: 'input-field-label',
-        labelFor: 'input-field-name-input-field',
-      })
-    })
-  })
-
-  describe('input value changes', () => {
-    it('updates currentValue when input changes', async () => {
-      await wrapper.findComponent({ name: 'BFormInput' }).vm.$emit('update:modelValue', 12)
-      expect(wrapper.vm.currentValue).toBe(12)
-    })
-  })
-
-  describe('error handling', () => {
-    it('displays error message when present', async () => {
-      useField.mockReturnValue({
-        value: ref(0),
-        errorMessage: ref('Error message'),
-        meta: ref({ valid: false }),
-      })
-      wrapper = createWrapper()
-
-      expect(wrapper.findComponent({ name: 'BFormInvalidFeedback' }).exists()).toBe(true)
-      expect(wrapper.findComponent({ name: 'BFormInvalidFeedback' }).text()).toBe('Error message')
-    })
-  })
-})
diff --git a/frontend/src/components/Inputs/InputHour.vue b/frontend/src/components/Inputs/InputHour.vue
deleted file mode 100644
index bb874ff93..000000000
--- a/frontend/src/components/Inputs/InputHour.vue
+++ /dev/null
@@ -1,54 +0,0 @@
-<template>
-  <div class="input-hour">
-    <BFormGroup :label="label" :label-for="labelFor">
-      <BFormInput
-        :id="labelFor"
-        :model-value="currentValue"
-        :name="name"
-        :placeholder="placeholder"
-        type="number"
-        :state="meta.valid"
-        step="0.25"
-        min="0"
-        :max="validMaxTime"
-        class="bg-248"
-        @update:model-value="currentValue = $event"
-      />
-      <BFormInvalidFeedback v-if="errorMessage">
-        {{ errorMessage }}
-      </BFormInvalidFeedback>
-    </BFormGroup>
-  </div>
-</template>
-
-<script setup>
-import { ref, computed, watch } from 'vue'
-import { useField } from 'vee-validate'
-
-const props = defineProps({
-  rules: {
-    type: Object,
-    default: () => ({}),
-  },
-  name: {
-    type: String,
-    required: true,
-  },
-  label: {
-    type: String,
-    required: true,
-  },
-  placeholder: {
-    type: String,
-    required: true,
-  },
-  validMaxTime: {
-    type: Number,
-    required: true,
-  },
-})
-
-const { value: currentValue, errorMessage, meta } = useField(props.name, props.rules)
-
-const labelFor = computed(() => `${props.name}-input-field`)
-</script>
diff --git a/frontend/src/components/Inputs/InputTextarea.spec.js b/frontend/src/components/Inputs/InputTextarea.spec.js
index 296bc22d4..dc04b5b63 100644
--- a/frontend/src/components/Inputs/InputTextarea.spec.js
+++ b/frontend/src/components/Inputs/InputTextarea.spec.js
@@ -8,6 +8,12 @@ vi.mock('vee-validate', () => ({
   useField: vi.fn(),
 }))
 
+vi.mock('vue-i18n', () => ({
+  useI18n: () => ({
+    t: (key) => key,
+  }),
+}))
+
 describe('InputTextarea', () => {
   let wrapper
 
diff --git a/frontend/src/components/Inputs/InputTextarea.vue b/frontend/src/components/Inputs/InputTextarea.vue
index 2d1d2a12e..e44179fc0 100644
--- a/frontend/src/components/Inputs/InputTextarea.vue
+++ b/frontend/src/components/Inputs/InputTextarea.vue
@@ -16,7 +16,7 @@
         @update:modelValue="currentValue = $event"
       />
       <BFormInvalidFeedback v-if="errorMessage">
-        {{ errorMessage }}
+        {{ translatedErrorString }}
       </BFormInvalidFeedback>
     </BFormGroup>
   </div>
@@ -25,6 +25,8 @@
 <script setup>
 import { computed } from 'vue'
 import { useField } from 'vee-validate'
+import { useI18n } from 'vue-i18n'
+import { translateYupErrorString } from '@/validationSchemas'
 
 const props = defineProps({
   rules: {
@@ -50,7 +52,8 @@ const props = defineProps({
 })
 
 const { value: currentValue, errorMessage, meta } = useField(props.name, props.rules)
-
+const { t } = useI18n()
+const translatedErrorString = computed(() => translateYupErrorString(errorMessage, t))
 const labelFor = computed(() => `${props.name}-input-field`)
 </script>
 
diff --git a/frontend/src/components/Inputs/LabeledInput.vue b/frontend/src/components/Inputs/LabeledInput.vue
new file mode 100644
index 000000000..920fceacd
--- /dev/null
+++ b/frontend/src/components/Inputs/LabeledInput.vue
@@ -0,0 +1,45 @@
+<template>
+  <div :class="wrapperClassName">
+    <BFormGroup :label="label" :label-for="labelFor">
+      <BFormTextarea
+        v-if="textarea"
+        v-bind="{ ...$attrs, id: labelFor, name }"
+        v-model="model"
+        trim
+        :rows="4"
+        :max-rows="4"
+        no-resize
+      />
+      <BFormInput v-else v-bind="{ ...$attrs, id: labelFor, name }" v-model="model" />
+      <slot></slot>
+    </BFormGroup>
+  </div>
+</template>
+
+<script setup>
+import { computed, defineOptions, defineModel } from 'vue'
+defineOptions({
+  inheritAttrs: false,
+})
+
+const props = defineProps({
+  label: {
+    type: String,
+    required: true,
+  },
+  name: {
+    type: String,
+    required: true,
+  },
+  textarea: {
+    type: Boolean,
+    required: false,
+    default: false,
+  },
+})
+
+const model = defineModel()
+
+const wrapperClassName = computed(() => (props.name ? `input-${props.name}` : 'input'))
+const labelFor = computed(() => `${props.name}-input-field`)
+</script>
diff --git a/frontend/src/components/Inputs/ValidatedInput.vue b/frontend/src/components/Inputs/ValidatedInput.vue
new file mode 100644
index 000000000..04c346292
--- /dev/null
+++ b/frontend/src/components/Inputs/ValidatedInput.vue
@@ -0,0 +1,82 @@
+<template>
+  <LabeledInput
+    v-bind="$attrs"
+    :min="minValue"
+    :max="maxValue"
+    :model-value="model"
+    :reset-value="resetValue"
+    :locale="$i18n.locale"
+    :required="!isOptional"
+    :label="label"
+    :name="name"
+    :state="valid"
+    @update:modelValue="updateValue"
+  >
+    <BFormInvalidFeedback v-if="errorMessage">
+      {{ errorMessage }}
+    </BFormInvalidFeedback>
+  </LabeledInput>
+</template>
+
+<script setup>
+import { computed, ref, watch } from 'vue'
+import { useI18n } from 'vue-i18n'
+import LabeledInput from './LabeledInput'
+import { translateYupErrorString } from '@/validationSchemas'
+
+const props = defineProps({
+  label: {
+    type: String,
+    required: true,
+  },
+  modelValue: [String, Number, Date],
+  name: {
+    type: String,
+    required: true,
+  },
+  rules: {
+    type: Object,
+    required: true,
+  },
+})
+
+const { t } = useI18n()
+
+const model = ref(props.modelValue)
+
+const valid = computed(() => props.rules.isValidSync(props.modelValue))
+const errorMessage = computed(() => {
+  if (props.modelValue === undefined || props.modelValue === '' || props.modelValue === null) {
+    return undefined
+  }
+  try {
+    props.rules.validateSync(props.modelValue)
+    return undefined
+  } catch (e) {
+    return translateYupErrorString(e.message, t)
+  }
+})
+
+const emit = defineEmits(['update:modelValue'])
+const updateValue = (newValue) => {
+  emit('update:modelValue', newValue, props.name, valid.value)
+}
+
+// update model and if value changed and model isn't null, check validation,
+// for loading Input with existing value and show correct validation state
+watch(
+  () => props.modelValue,
+  () => {
+    model.value = props.modelValue
+  },
+)
+
+// extract additional parameter like min and max from schema
+const schemaDescription = computed(() => props.rules.describe())
+const getTestParameter = (name) =>
+  schemaDescription.value?.tests?.find((t) => t.name === name)?.params[name]
+const minValue = computed(() => getTestParameter('min'))
+const maxValue = computed(() => getTestParameter('max'))
+const resetValue = computed(() => schemaDescription.value.default)
+const isOptional = computed(() => schemaDescription.value.optional)
+</script>
diff --git a/frontend/src/constants.js b/frontend/src/constants.js
new file mode 100644
index 000000000..2a40a57c8
--- /dev/null
+++ b/frontend/src/constants.js
@@ -0,0 +1 @@
+export const GDD_PER_HOUR = 20
diff --git a/frontend/src/locales/de.json b/frontend/src/locales/de.json
index dd34fbad4..daa449afd 100644
--- a/frontend/src/locales/de.json
+++ b/frontend/src/locales/de.json
@@ -76,7 +76,6 @@
       "allContributions": "Es wurden noch keine Beiträge eingereicht.",
       "myContributions": "Du hast noch keine Beiträge eingereicht."
     },
-    "noDateSelected": "Wähle irgendein Datum im Monat",
     "noOpenCreation": {
       "allMonth": "Für alle beiden Monate ist dein Schöpfungslimit erreicht. Den Nächsten Monat kannst du wieder 1000 GDD Schöpfen.",
       "lastMonth": "Für den ausgewählten Monat ist das Schöpfungslimit erreicht.",
@@ -185,9 +184,17 @@
     "username": "Benutzername",
     "username-placeholder": "Wähle deinen Benutzernamen",
     "validation": {
-      "gddCreationTime": "Das Feld {_field_} muss eine Zahl zwischen {min} und {max} mit höchstens einer Nachkommastelle sein",
+      "gddCreationTime": {
+        "min": "Die Stunden sollten mindestens {min} groß sein",
+        "max": "Die Stunden sollten höchstens {max} groß sein",
+        "decimal-places": "Die Stunden sollten maximal zwei Nachkommastellen enthalten"
+      },
       "gddSendAmount": "Das Feld {_field_} muss eine Zahl zwischen {min} und {max} mit höchstens zwei Nachkommastellen sein",
       "is-not": "Du kannst dir selbst keine Gradidos überweisen",
+      "memo": {
+        "min": "Die Tätigkeitsbeschreibung sollte mindestens {min} Zeichen lang sein",
+        "max": "Die Tätigkeitsbeschreibung sollte höchstens {max} Zeichen lang sein"
+      },
       "requiredField": "{fieldName} ist ein Pflichtfeld",
       "username-allowed-chars": "Der Nutzername darf nur aus Buchstaben (ohne Umlaute), Zahlen, Binde- oder Unterstrichen bestehen.",
       "username-hyphens": "Binde- oder Unterstriche müssen zwischen Buchstaben oder Zahlen stehen.",
diff --git a/frontend/src/locales/en.json b/frontend/src/locales/en.json
index 9346ea609..8c49ce4de 100644
--- a/frontend/src/locales/en.json
+++ b/frontend/src/locales/en.json
@@ -76,7 +76,6 @@
       "allContributions": "No contributions have been submitted yet.",
       "myContributions": "You have not submitted any entries yet."
     },
-    "noDateSelected": "Choose any date in the month",
     "noOpenCreation": {
       "allMonth": "For all two months your creation limit is reached. The next month you can create 1000 GDD again.",
       "lastMonth": "The creation limit is reached for the selected month.",
@@ -185,9 +184,17 @@
     "username": "Username",
     "username-placeholder": "Choose your username",
     "validation": {
-      "gddCreationTime": "The field {_field_} must be a number between {min} and {max} with at most one decimal place.",
+      "gddCreationTime": {
+        "min": "The hours should be at least {min} in size",
+        "max": "The hours should not be larger than {max}",
+        "decimal-places": "The hours should contain a maximum of two decimal places"
+      },
       "gddSendAmount": "The {_field_} field must be a number between {min} and {max} with at most two digits after the decimal point",
       "is-not": "You cannot send Gradidos to yourself",
+      "memo": {
+        "min": "The job description should be at least {min} characters long",
+        "max": "The job description should not be longer than {max} characters"
+      },
       "requiredField": "The {fieldName} field is required",
       "username-allowed-chars": "The username may only contain letters, numbers, hyphens or underscores.",
       "username-hyphens": "Hyphens or underscores must be in between letters or numbers.",
diff --git a/frontend/src/pages/Community.vue b/frontend/src/pages/Community.vue
index 6ab7d9875..6d7ab8ba0 100644
--- a/frontend/src/pages/Community.vue
+++ b/frontend/src/pages/Community.vue
@@ -10,9 +10,7 @@
           />
           <div class="mb-3"></div>
           <contribution-form
-            :key="computedKeyFromForm"
             v-model="form"
-            :is-this-month="isThisMonth"
             :minimal-date="minimalDate"
             :max-gdd-last-month="maxForMonths[0]"
             :max-gdd-this-month="maxForMonths[1]"
@@ -70,6 +68,7 @@ import { createContribution, updateContribution, deleteContribution } from '@/gr
 import { listContributions, listAllContributions, openCreations } from '@/graphql/queries'
 import { useAppToast } from '@/composables/useToast'
 import { useI18n } from 'vue-i18n'
+import { GDD_PER_HOUR } from '../constants'
 
 const COMMUNITY_TABS = ['contribute', 'contributions', 'community']
 
@@ -92,10 +91,10 @@ const contributionCount = ref(0)
 const contributionCountAll = ref(0)
 const form = ref({
   id: null,
-  date: '',
+  date: undefined,
   memo: '',
-  hours: 0,
-  amount: '',
+  hours: '',
+  amount: GDD_PER_HOUR,
 })
 const originalContributionDate = ref('')
 const updateAmount = ref('')
@@ -107,15 +106,7 @@ const minimalDate = computed(() => {
   return new Date(date.setMonth(date.getMonth() - 1, 1))
 })
 
-const isThisMonth = computed(() => {
-  const formDate = new Date(form.value.date)
-  return (
-    formDate.getFullYear() === maximalDate.value.getFullYear() &&
-    formDate.getMonth() === maximalDate.value.getMonth()
-  )
-})
-
-const amountToAdd = computed(() => (form.value.id ? parseInt(updateAmount.value) : 0))
+const amountToAdd = computed(() => (form.value.id ? parseFloat(updateAmount.value) : 0.0))
 
 const maxForMonths = computed(() => {
   const originalDate = new Date(originalContributionDate.value)
@@ -125,18 +116,13 @@ const maxForMonths = computed(() => {
         creation.year === originalDate.getFullYear() &&
         creation.month === originalDate.getMonth()
       ) {
-        return parseInt(creation.amount) + amountToAdd.value
+        return parseFloat(creation.amount) + amountToAdd.value
       }
-      return parseInt(creation.amount)
+      return parseFloat(creation.amount)
     })
   }
   return [0, 0]
 })
-
-const computedKeyFromForm = computed(() => {
-  return `${form.value.id}_${form.value.date}_${form.value.memo}_${form.value.amount}_${form.value.hours}`
-})
-
 const { onResult: onOpenCreationsResult, refetch: refetchOpenCreations } = useQuery(
   openCreations,
   () => ({}),
@@ -279,7 +265,7 @@ const handleUpdateContributionForm = (item) => {
     memo: item.memo,
     amount: item.amount,
     hours: item.amount / 20,
-  }
+  } //* /
   originalContributionDate.value = item.contributionDate
   updateAmount.value = item.amount
   tabIndex.value = 0
diff --git a/frontend/src/validationSchemas.js b/frontend/src/validationSchemas.js
new file mode 100644
index 000000000..e4f1194cf
--- /dev/null
+++ b/frontend/src/validationSchemas.js
@@ -0,0 +1,21 @@
+import { string } from 'yup'
+
+// TODO: only needed for grace period, before all inputs updated for using veeValidate + yup
+export const isLanguageKey = (str) =>
+  str.match(/^(?!\.)[a-z][a-zA-Z0-9-]*([.][a-z][a-zA-Z0-9-]*)*(?<!\.)$/)
+
+export const translateYupErrorString = (error, t) => {
+  const type = typeof error
+  if (type === 'object') {
+    return t(error.key, error.values)
+  } else if (type === 'string' && error.length > 0 && isLanguageKey(error)) {
+    return t(error)
+  } else {
+    return error
+  }
+}
+
+export const memo = string()
+  .required('contribution.yourActivity')
+  .min(5, ({ min }) => ({ key: 'form.validation.memo.min', values: { min } }))
+  .max(255, ({ max }) => ({ key: 'form.validation.memo.max', values: { max } }))
diff --git a/frontend/yarn.lock b/frontend/yarn.lock
index 71034c59d..8036b3e46 100644
--- a/frontend/yarn.lock
+++ b/frontend/yarn.lock
@@ -1658,13 +1658,12 @@
     vee-validate "4.14.7"
 
 "@vee-validate/yup@^4.14.1":
-  version "4.14.7"
-  resolved "https://registry.yarnpkg.com/@vee-validate/yup/-/yup-4.14.7.tgz#a029151394ae4fbc7a038dbb49acc86f2ba78ddc"
-  integrity sha512-sMLkSXbVWIFK0BE8gEp2Gcdd3aqpTggBjbkrYmcdgyHBeYoPmhBHhUpkXDFhmsckie2xv6lNTicGO5oJt71N1Q==
+  version "4.15.0"
+  resolved "https://registry.yarnpkg.com/@vee-validate/yup/-/yup-4.15.0.tgz#409f9b57414fadd5b86bc6ada18cd51a7ccd121c"
+  integrity sha512-paK2ZdxZJRrUGwqaqf7KMNC+n5C7UGs7DofK7wZCza/zKT/QtFSxVYgopGoYYrbAfd6DpVmNpf/ouBuRdPBthA==
   dependencies:
     type-fest "^4.8.3"
-    vee-validate "4.14.7"
-    yup "^1.3.2"
+    vee-validate "4.15.0"
 
 "@vitejs/plugin-vue@5.1.4":
   version "5.1.4"
@@ -7126,6 +7125,14 @@ vee-validate@4.14.7, vee-validate@^4.13.2:
     "@vue/devtools-api" "^7.5.2"
     type-fest "^4.8.3"
 
+vee-validate@4.15.0:
+  version "4.15.0"
+  resolved "https://registry.yarnpkg.com/vee-validate/-/vee-validate-4.15.0.tgz#eb77a9c867669d34abbc33ca5e16f2a991eb7ad5"
+  integrity sha512-PGJh1QCFwCBjbHu5aN6vB8macYVWrajbDvgo1Y/8fz9n/RVIkLmZCJDpUgu7+mUmCOPMxeyq7vXUOhbwAqdXcA==
+  dependencies:
+    "@vue/devtools-api" "^7.5.2"
+    type-fest "^4.8.3"
+
 vite-node@2.1.8:
   version "2.1.8"
   resolved "https://registry.yarnpkg.com/vite-node/-/vite-node-2.1.8.tgz#9495ca17652f6f7f95ca7c4b568a235e0c8dbac5"
@@ -7502,7 +7509,7 @@ yocto-queue@^0.1.0:
   resolved "https://registry.yarnpkg.com/yocto-queue/-/yocto-queue-0.1.0.tgz#0294eb3dee05028d31ee1a5fa2c556a6aaf10a1b"
   integrity sha512-rVksvsnNCdJ/ohGc6xgPwyN8eheCxsiLM8mxuE/t/mOVqJewPuO1miLpTHQiRgTKCLexL4MeAFVagts7HmNZ2Q==
 
-yup@^1.3.2, yup@^1.4.0:
+yup@^1.4.0:
   version "1.6.1"
   resolved "https://registry.yarnpkg.com/yup/-/yup-1.6.1.tgz#8defcff9daaf9feac178029c0e13b616563ada4b"
   integrity sha512-JED8pB50qbA4FOkDol0bYF/p60qSEDQqBD0/qeIrUCG1KbPBIQ776fCUNb9ldbPcSTxA69g/47XTo4TqWiuXOA==