"Sun, 15 Jun 2025 14:45:43"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
20250615
Only TIME
14:45:43
General datetime
2025-06-15 14:45:43Z
For Database
2025-06-15 14:45:43
For HTTP1.1
Sun, 15 Jun 2025 14:45:43 GMT