"Sat, 18 May 2024 18:23:15"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
20240518
Only TIME
18:23:15
General datetime
2024-05-18 18:23:15Z
For Database
2024-05-18 18:23:15
For HTTP1.1
Sat, 18 May 2024 18:23:15 GMT