"Sun, 21 Apr 2024 09:09:15"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
20240421
Only TIME
09:09:15
General datetime
2024-04-21 09:09:15Z
For Database
2024-04-21 09:09:15
For HTTP1.1
Sun, 21 Apr 2024 09:09:15 GMT