"Sun, 01 Feb 1970 14:06:38"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700201
Only TIME
14:06:38
General datetime
1970-02-01 14:06:38Z
For Database
1970-02-01 14:06:38
For HTTP1.1
Sun, 01 Feb 1970 14:06:38 GMT