"Mon, 20 May 2024 19:57:21"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
20240520
Only TIME
19:57:21
General datetime
2024-05-20 19:57:21Z
For Database
2024-05-20 19:57:21
For HTTP1.1
Mon, 20 May 2024 19:57:21 GMT