Add a setter on DateTimeNormalizer to change the default context at run…

[fabpot]

Q	A
Feature PR	symfony/symfony#44125
PR author(s)	@Seldaek
Merged in	5.4

[carsonbot]

Thank you for this issue.
There has not been a lot of activity here for a while. Has this been resolved?

[carsonbot]

Just a quick reminder to make a comment on this. If I don't hear anything I'll close this.

[javiereguiluz]

Closing in favor of #17912, a meta-issue that groups all pending serializer-related issues so we can easily check them.