OK it does fail on custom formatting of this date EEEE d MMMM
Another leap year this year 2020 :) wonder if it will be fixed in 2024
This error still persists. When using a custom dateformat (e.g. dd MMM) i get an ‘Invalid Date’ error.
When i set the format to Date or DateTime the february 29 error diappears.
@Mendix Beheer Enexis
We fixed the custom date formatting issue in 8.7
If a date picker widget has a custom date pattern without year tokens, it will now use the year of its current value when parsing a new value. This ensures that, for example, February 29th is recognized as a valid date if the current value falls within a leap year. The Pluggable Widgets API has been enhanced to cover this use case as well. (Ticket 92181)