"Sun, 15 Sep 2024 16:16:21"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
20240915
Only TIME
16:16:21
General datetime
2024-09-15 16:16:21Z
For Database
2024-09-15 16:16:21
For HTTP1.1
Sun, 15 Sep 2024 16:16:21 GMT