diff --git a/backend/src/server/context.ts b/backend/src/server/context.ts
index 5bfc22e72..dd4056e42 100644
--- a/backend/src/server/context.ts
+++ b/backend/src/server/context.ts
@@ -9,7 +9,7 @@ export interface Context {
   setHeaders: { key: string; value: string }[]
   role?: Role
   user?: dbUser
-  clientRequestTime?: string
+  clientTimezoneOffset?: number
   // hack to use less DB calls for Balance Resolver
   lastTransaction?: dbTransaction
   transactionCount?: number
@@ -19,7 +19,7 @@ export interface Context {
 
 const context = (args: ExpressContext): Context => {
   const authorization = args.req.headers.authorization
-  const clientRequestTime = args.req.headers.clientrequesttime
+  const clientTimezoneOffset = args.req.headers.clienttimezoneoffset
   const context: Context = {
     token: null,
     setHeaders: [],
@@ -27,8 +27,8 @@ const context = (args: ExpressContext): Context => {
   if (authorization) {
     context.token = authorization.replace(/^Bearer /, '')
   }
-  if (clientRequestTime && typeof clientRequestTime === 'string') {
-    context.clientRequestTime = clientRequestTime
+  if (clientTimezoneOffset && typeof clientTimezoneOffset === 'string') {
+    context.clientTimezoneOffset = Number(clientTimezoneOffset)
   }
   return context
 }
@@ -38,4 +38,10 @@ export const getUser = (context: Context): dbUser => {
   throw new Error('No user given in context!')
 }
 
+export const getClientTimezoneOffset = (context: Context): number => {
+  if (context.clientTimezoneOffset && Math.abs(context.clientTimezoneOffset) <= 27 * 60)
+    return context.clientTimezoneOffset
+  throw new Error('No valid client time zone offset in context!')
+}
+
 export default context