"Sun, 15 Jun 2025 14:45:18"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
20250615
Only TIME
14:45:18
General datetime
2025-06-15 14:45:18Z
For Database
2025-06-15 14:45:18
For HTTP1.1
Sun, 15 Jun 2025 14:45:18 GMT