"Mon, 20 May 2024 18:21:18"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
20240520
Only TIME
18:21:18
General datetime
2024-05-20 18:21:18Z
For Database
2024-05-20 18:21:18
For HTTP1.1
Mon, 20 May 2024 18:21:18 GMT