"Mon, 21 Jul 2025 14:45:16"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
20250721
Only TIME
14:45:16
General datetime
2025-07-21 14:45:16Z
For Database
2025-07-21 14:45:16
For HTTP1.1
Mon, 21 Jul 2025 14:45:16 GMT