A client ask me that question, and frankly that something that i heard even amount others developers.
Because at the startup i'm working we're using Firestore as our DB.
So a make a quick recap on how to respond to this question:
The reason is, since Google Firestore store date & time as Timestamp. which follows the RFC 3339, that is a format of the ISO 8601.
An standard to represent date & time using Gregorian Calendar
So when we store date & time, it set by default to UTC, you can also change it.
And we're using momentjs format method to set that to user's localtime.
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