"Sat, 12 Jul 2025 14:45:21"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
20250712
Only TIME
14:45:21
General datetime
2025-07-12 14:45:21Z
For Database
2025-07-12 14:45:21
For HTTP1.1
Sat, 12 Jul 2025 14:45:21 GMT