"Mon, 13 May 2024 20:15:21"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
20240513
Only TIME
20:15:21
General datetime
2024-05-13 20:15:21Z
For Database
2024-05-13 20:15:21
For HTTP1.1
Mon, 13 May 2024 20:15:21 GMT