Locales that prioritize 2-digit years shows invalid year in admin date picker.

[Aldian Fazrihady]

I am using id locale. Somehow, on that locale, the django admin uses two digits year to be displayed in input fields.
The datepicker UI will display this wrong year:

Instead of showing year 2019, it shows year 1919.
If I changed the locale to en, the datepicker will display the correct year (2019). I also noticed that en by default uses 4 digits year in input fields.

Therefore, my workaround for this problem is to use 4 digits year for that locale by configuring FORMAT_MODULE_PATH. Now datepicker shows the correct year on id locale.

However, it is quite clear that there is a bug in the datepicker display that happens when two digits year format is used.

[Aldian Fazrihady]

screenshot

[Mariusz Felisiak]

I agree we should prioritize date formats with 4-digits year in id locales, e.g.

diff --git a/django/conf/locale/id/formats.py b/django/conf/locale/id/formats.py
index 1458230c28..de2d1535ff 100644
--- a/django/conf/locale/id/formats.py
+++ b/django/conf/locale/id/formats.py
@@ -14,8 +14,8 @@ FIRST_DAY_OF_WEEK = 1  # Monday
 # The *_INPUT_FORMATS strings use the Python strftime format syntax,
 # see https://docs.python.org/library/datetime.html#strftime-strptime-behavior
 DATE_INPUT_FORMATS = [
-    '%d-%m-%y', '%d/%m/%y',             # '25-10-09', 25/10/09'
     '%d-%m-%Y', '%d/%m/%Y',             # '25-10-2009', 25/10/2009'
+    '%d-%m-%y', '%d/%m/%y',             # '25-10-09', 25/10/09'
     '%d %b %Y',                         # '25 Oct 2006',
     '%d %B %Y',                         # '25 October 2006'
 ]

[Mariusz Felisiak <felisiak.mariusz@…>]

In 55035777:

Refs #30819 -- Prioritized the date format with four-digit year for the Indonesian (id) locale.

[Mariusz Felisiak <felisiak.mariusz@…>]

In cf5d4701:

Fixed #30819 -- Fixed year determination in admin calendar widget for two-digit years.

Two-digit years in the range of [00, 68] are in the current century,
while [69,99] are in the previous century, according to the Open Group
Specification.