"Sat, 15 Jun 2024 13:40:11"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
20240615
Only TIME
13:40:11
General datetime
2024-06-15 13:40:11Z
For Database
2024-06-15 13:40:11
For HTTP1.1
Sat, 15 Jun 2024 13:40:11 GMT