"Sun, 13 Jul 2025 14:45:13"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
20250713
Only TIME
14:45:13
General datetime
2025-07-13 14:45:13Z
For Database
2025-07-13 14:45:13
For HTTP1.1
Sun, 13 Jul 2025 14:45:13 GMT