Contact Form / Date Picker: add date validation in all browsers

[jeherve]

In Firefox and Safari if I type in the date field, instead of using the date picker, I can enter any numbers (e.g. 12345) and submit the form. There’s no date validation.

It does not seem to be perfect in Chrome either:

In Chrome if I type in the date field it enforces the date to some extent, but I can enter a 6-digit year (e.g. 01/01/111111). The maximum year value it accepts is 275760, so maybe this is just the maximum year that Chrome accepts? It still seems weird.

[rclations]

@jeherve Since all validation was removed in #7890, is this something that should still be added?

[jeherve]

Good point.

I think I'll edit the original description, because I think it would be valuable to have date validation in the future.

[stale[bot]]

This issue has been marked as stale. This happened because:

• It has been inactive in the past 6 months.
• It hasn’t been labeled `[Pri] Blocker`, `[Pri] High`.

No further action is needed. But it's worth checking if this ticket has clear reproduction steps and it is still reproducible. Feel free to close this issue if you think it's not valid anymore — if you do, please add a brief explanation.

[jeherve]

This was also brought up in #16815. cc @MuhammedSwalihct

Now that a few years have passed, it may be worth reconsidering using the date input type we had removed in #7890. Browser support may have improved over the years.

[jeherve]

Related: #11251