what is unix timestamp?
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A Unix timestamp, also known as POSIX time or Unix epoch time, is a system for tracking time as a running total of seconds since the Unix epoch, which is defined as January 1, 1970, 00:00:00 UTC (Coordinated Universal Time). It represents the number of seconds that have elapsed since that point in time. Unix timestamps are widely used in computing systems and databases for timestamping events, calculating time differences, and other time-related operations due to their simplicity and universality across different platforms and programming languages.