"Mon, 20 May 2024 16:23:21"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
20240520
Only TIME
16:23:21
General datetime
2024-05-20 16:23:21Z
For Database
2024-05-20 16:23:21
For HTTP1.1
Mon, 20 May 2024 16:23:21 GMT