Is this attribute set to Localize (in the domain model)? If so, I would suggest setting Localize to no. I think this will resolve your issue.
You can read a bit more about this here: https://docs.mendix.com/refguide/date-and-time-handling#6-to-localize-or-not-to-localize but the best practice is if the time element of a datetime attribute is not needed for your app, set Localize to no.
This module might be of help as wel: https://learn.mendix.com/link/module/374/lecture/3046/7.1-Introduction