"Sun, 04 Jan 1970 07:38:32"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700104
Only TIME
07:38:32
General datetime
1970-01-04 07:38:32Z
For Database
1970-01-04 07:38:32
For HTTP1.1
Sun, 04 Jan 1970 07:38:32 GMT