"Mon, 20 May 2024 20:15:07"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
20240520
Only TIME
20:15:07
General datetime
2024-05-20 20:15:07Z
For Database
2024-05-20 20:15:07
For HTTP1.1
Mon, 20 May 2024 20:15:07 GMT