"Sun, 15 Jun 2025 14:45:27"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
20250615
Only TIME
14:45:27
General datetime
2025-06-15 14:45:27Z
For Database
2025-06-15 14:45:27
For HTTP1.1
Sun, 15 Jun 2025 14:45:27 GMT