Regression for date of birth formatting for English (United Kingdom)

Avoid duplicates

• Bug is not mentioned in the FAQ
• Bug is specific for Android only, for general issues / questions that apply to iOS and Android please raise them in the documentation repository
• Bug is not already reported in another issue Follows on from https://github.com/corona-warn-app/cwa-app-android/issues/4014 (EXPOSUREAPP-9297).

Technical details

• Device name: Google Pixel 3a emulator
• Android version: 11
• First reported in App version: 2.10.1
• Confirmed still present in App version 2.19.2

Describe the bug

If the device locale is set to English (United Kingdom) the date of birth shown in the “Born” field in a certificate displays with format mm/dd/yyyy which does not follow the locale standard of dd/mm/yyyy for English (United Kingdom).

(In version CWA 2.9.0 with locale set to English (United Kingdom) the date of birth was displayed as dd.mm.yyyy, which uses the correct order of day, month and year, although the delimiter “.” is not normally used in UK. The delimiter used in the United Kingdom is commonly “/”.)

Steps to reproduce the issue

Locale set to English (United Kingdom)

On physical device:

1. Tap “Scan” button
2. Scan 2/2 vaccination certificate
3. Tap back arrow
4. Tap “Certificates”
5. QR code
6. Scroll down to “Born”
7. Note that date of birth is wrongly formatted as mm/dd/yyyy

Alternatively on Pixel 3a API 30 (Android 11) emulator

1. Settings > System > Languages and input > Languages
   set to English (United Kingdom)
2. Settings > System > Date & time
   disable “Use locale default”/ disable “Use 24-hour format”
3. Settings > Display > Advanced > Font Size, set Small
4. In Android Studio Build > Select BuildVariant deviceForTestersDebug
5. run PersonDetailsFragmentTest.kt on emulator
6. View > Tools Windows > Device File Explorer
7. Go to /data/data/de.rki.coronawarnapp.test/screenshots
8. View screenshots and check the formatting of all dates in PersonDetailsFragment*.png

See here for example PersonDetailsFragment_booster_2.png

Expected behavior

If the device locale is set to English (United Kingdom) then a date of birth displayed in a numerical form should start with day of the month followed by month then year in that order as in dd/mm/yyyy.

Possible Fix

Revise formatBirthDate in Corona-Warn-App/src/main/java/de/rki/coronawarnapp/covidcertificate/person/ui/details/items/CwaUserCard.kt to take care of device’s chosen locale.

The delimiter “/” cannot be used to infer what order the fields dd, mm and yyyy should be displayed.

Additional information

PR https://github.com/corona-warn-app/cwa-app-android/pull/4036 changed the date of birth formatting in certificates for release/2.10.x.

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Internal Tracking ID: EXPOSUREAPP-9595

[dsarkar]

@MikeMcC399 Thanks for the feedback.

[dsarkar]

Internal Tracking ID: EXPOSUREAPP-9595