In most cases, customizers/administrators leave the Date & Time field as Local without paying much attention to detail.
With involvement of time, there are 2 behaviors while creating the field (or changing them, but there’s a catch)
You can change from Local to Time-Zone Independent any time, but can’t change from Time-Zone Independent to User Local once saved this way.
User Local
The Date &…
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Date and Time field’s Time-Zone behavior in D365 – D365 Demystified
Important to note the differences between the types of Date and Time fields. Take a look.
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