"Sun, 15 Dec 2024 09:19:21"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
20241215
Only TIME
09:19:21
General datetime
2024-12-15 09:19:21Z
For Database
2024-12-15 09:19:21
For HTTP1.1
Sun, 15 Dec 2024 09:19:21 GMT