"Sat, 21 Dec 2024 15:49:18"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
20241221
Only TIME
15:49:18
General datetime
2024-12-21 15:49:18Z
For Database
2024-12-21 15:49:18
For HTTP1.1
Sat, 21 Dec 2024 15:49:18 GMT