Year input value changes unexpectedly on pressing Enter.

[minamz]

This is happening with datepickers we use with locale: Japanese, and using dateFormat "Y年m月d日".
We are continuing investigation to find if issue is on our side but not yet found the reason.

To reproduce

• open datepicker and change MONTH dropdown ; select any other MONTH (other than January)
• hit Enter
• the YEAR changes to an unexpected value.

Basically anytime a MONTH is selected and press Enter, the year input value changes to undesired values; with the exception of January (which doesn't reproduce the behavior.)

Please see below animation:

Also noticed the pattern
January -> no change of year
Feb -> year changes to 1901
March -> 1902
April -> 1903
May -> 1904
etc.