"Sun, 15 Dec 2024 18:00:21"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
20241215
Only TIME
18:00:21
General datetime
2024-12-15 18:00:21Z
For Database
2024-12-15 18:00:21
For HTTP1.1
Sun, 15 Dec 2024 18:00:21 GMT