4024: fix incorrect date when changing year from leap to normal

[lightbringer1991]

This is the fix for #4024

Changes:
If date is 29/02/xxxx, in which xxxx is a leap year, then:

• when changing year to a normal year, the date should become 28/02/yyyy
• when changing to a leap year, the date should become 29/02/zzzz

[jsf-clabot]

All committers have signed the CLA.

[ichernev]

Close in favor of #4255