[Feature] 13665 date time format not respected

[``* `#13665` Date/Time format not respected``](https://www.openproject.org/work_packages/13665)
[``* `#13664` Timezone not respected``](https://www.openproject.org/work_packages/13664)
Ahh, thanks for the hint. :+1: It wasn't working for me the first time because I ignored the semicolons.