"Sun, 15 Dec 2024 15:44:12"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
20241215
Only TIME
15:44:12
General datetime
2024-12-15 15:44:12Z
For Database
2024-12-15 15:44:12
For HTTP1.1
Sun, 15 Dec 2024 15:44:12 GMT