Why are two readable times different for the same Unix timestamp?
The underlying timestamp can be the same while the displayed clock time differs because different time zones are being used.
Convert Unix epoch timestamps (seconds & milliseconds) to human-readable UTC and local time.
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Paste raw seconds (10 digits) or milliseconds (13 digits).
See UTC date, Local timezone, ISO 8601 string, and relative time.
The underlying timestamp can be the same while the displayed clock time differs because different time zones are being used.
Check the documentation of the source system. Many programming APIs use one convention consistently, but you should not guess when accuracy matters.
Yes, it can represent a precise instant, but a human-facing deadline should also state the intended time zone.
Unix epoch time is the number of seconds that have elapsed since January 1, 1970 00:00:00 UTC, not counting leap seconds.