Save DateTime objects in UTC

[Guite]

What?

• Datetime fields
• Standard fields (createdDate, updatedDate)

How?

• https://docs.ziku.la/Development/Doctrine/utcdatetypetype.html
• Example
• Also update constraints (add timezone to e.g. LessThan, see docs)

When?

• As soon as @gfr worked out how to properly handle the user timezone in Twig