Validation of field "Date de sortie" is inconsistent

[ghiss75]

The validation pattern of the form for "live feedback" is not conforming to the format of the placeholder:

This pattern is expecting something of the format: 20/03/2021:

that is not working because, the pattern does not support year > 2020

Note: A pull request fixing this issue has already been proposed: #9

Still, there is another issue as when the form is submitted, the field is validated with following pattern:

attestation-deplacement-derogatoire-covid-19/src/js/form-util.js

Lines 34 to 36 in 1fc8aed

	'#field-datesortie': {
	pattern: /\d{4}-\d{2}-\d{2}/g,
	},

that is expecting the same format as the placeholder.

From a user perspective it could be confusing as when entering a date conforming to the placeholder, the "live feedback" will indicate an incorrect input, still the form will be validated when clicking on the generate button.

Originally posted by @ghiss75 in #2 (comment)

[usmonster]

Just to clarify: this last issue is visible only on Safari desktop.

[R4F4L3]

The regex pattern dont look like a valid datetime ( UTC or whatever GMT ) filter.
2505-05-45 looks like a valid timestamp :>