For existing date and date&time types there’s no way to adjust how they’re displayed because it’s tied to system locales. My laptop displays 17/08/2026 16:16 but my phone would show 08/17/2026 4:16 PM and the only way I can change that is by changing entire language/region which is very inconvenient.
Another issue is that default date types are ambiguous. I could decide them to be in local time or in UTC (if I travel a lot or deal a lot with multiple time zones ). Might decide one thing but later forget and use another and now it’s all messy confusing.
Proposed solution
A new property type that would allow using Unix timestamp value like 1786972560 and then somewhere in settings a field for desired display format that users can specify for themselves that wouldn’t depend on OS.
For convenience it could also have Date popup editor but adjusted to have time zones selector.
This could easily be a separate plugin instead but Obsidian lacks API to define custom property types at the moment.