"Mon, 20 May 2024 18:21:23"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
20240520
Only TIME
18:21:23
General datetime
2024-05-20 18:21:23Z
For Database
2024-05-20 18:21:23
For HTTP1.1
Mon, 20 May 2024 18:21:23 GMT