set minimum birthday to 13 years ago (#7808)

src/components/dialogs/BirthDateSettings.tsx

@@ -4,6 +4,7 @@ import {msg, Trans} from '@lingui/macro'
 import {useLingui} from '@lingui/react'
 
 import {cleanError} from '#/lib/strings/errors'
+import {getDateAgo} from '#/lib/strings/time'
 import {logger} from '#/logger'
 import {isIOS, isWeb} from '#/platform/detection'
 import {
@@ -101,7 +102,7 @@ function BirthdayInner({
           onChangeDate={newDate => setDate(new Date(newDate))}
           label={_(msg`Birthday`)}
           accessibilityHint={_(msg`Enter your birth date`)}
-          maximumDate={new Date()}
+          maximumDate={getDateAgo(13)}
         />
       </View>
 

src/lib/strings/time.ts

@@ -19,6 +19,17 @@ export function getAge(birthDate: Date): number {
   return age
 }
 
+/**
+ * Get a Date object that is N years ago from now
+ * @param years number of years
+ * @returns Date object
+ */
+export function getDateAgo(years: number): Date {
+  const date = new Date()
+  date.setFullYear(date.getFullYear() - years)
+  return date
+}
+
 /**
  * Compares two dates by year, month, and day only
  */