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