"Sat, 21 Dec 2024 18:18:36"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
20241221
Only TIME
18:18:36
General datetime
2024-12-21 18:18:36Z
For Database
2024-12-21 18:18:36
For HTTP1.1
Sat, 21 Dec 2024 18:18:36 GMT