Userforms datefield in locale that doesn't use en_US format doesn't validate

[Gelert]

I recently had the same question about the date picker.

Add this to your composer to bring back a calendar

    "silverware/calendar": "^1.1",

Link: GitHub - praxisnetau/silverware-calendar: SilverWare Calendar Module

Recently answered here:

SilverStripe 4 Date Entry in the CMS - showing a calendar? How?

How do you make the CMS Admin display a handy calendar for Date entry with SS4.2.1? I’ve upgraded a section of a site from SS3 to SS4 and I’ve failed so far to figure out how to get the calendar to display. I’ve formatted the Date how my users would like it just fine. I read all the GitHub discussion about this and it seemed that things were added in some SS4 releases and were then changed and removed in later versions. What’s the trick please? $dateField = new DateField(‘FromDate’); //$dat…

Sorry can’t help with your locale validation.