"Sun, 21 Apr 2024 18:21:55"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
20240421
Only TIME
18:21:55
General datetime
2024-04-21 18:21:55Z
For Database
2024-04-21 18:21:55
For HTTP1.1
Sun, 21 Apr 2024 18:21:55 GMT