Date/time custom profile fields

[leonstr]

If you have a date/time custom user profile field this is shown as the Epoch value. For example, if the site has a date of birth field with short name dob, and you add Date of birth: [[dob]] to local_welcome | message_moderator then the message contains a value such as Date of birth: 337647600.

local_welcome 2021081600 on Moodle 4.1.4+ (Build: 20230728).

[leonstr]

Add PR #20.