"Sat, 15 Jun 2024 18:38:20"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
20240615
Only TIME
18:38:20
General datetime
2024-06-15 18:38:20Z
For Database
2024-06-15 18:38:20
For HTTP1.1
Sat, 15 Jun 2024 18:38:20 GMT