"Sun, 15 Dec 2024 18:54:06"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
20241215
Only TIME
18:54:06
General datetime
2024-12-15 18:54:06Z
For Database
2024-12-15 18:54:06
For HTTP1.1
Sun, 15 Dec 2024 18:54:06 GMT