"Mon, 20 May 2024 14:13:15"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
20240520
Only TIME
14:13:15
General datetime
2024-05-20 14:13:15Z
For Database
2024-05-20 14:13:15
For HTTP1.1
Mon, 20 May 2024 14:13:15 GMT