"Sat, 21 Dec 2024 15:36:12"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
20241221
Only TIME
15:36:12
General datetime
2024-12-21 15:36:12Z
For Database
2024-12-21 15:36:12
For HTTP1.1
Sat, 21 Dec 2024 15:36:12 GMT