"Sun, 18 Aug 2024 21:20:21"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
20240818
Only TIME
21:20:21
General datetime
2024-08-18 21:20:21Z
For Database
2024-08-18 21:20:21
For HTTP1.1
Sun, 18 Aug 2024 21:20:21 GMT