1639958805.3686059-0.mp4

Because the timestamp is a numerical value that increases over time, files named this way will naturally sort in chronological order in most file explorers.

The string of numbers represents the number of seconds that have elapsed since the (January 1, 1970, at 00:00:00 UTC). Unix Timestamp: 1639958805.3686059 Decoded Date: Monday, December 20, 2021 Decoded Time: 00:06:45.368 UTC 1639958805.3686059-0.mp4

Do you need help from this file or renaming it to a more readable date format? Because the timestamp is a numerical value that