"Sun, 04 Jan 1970 23:31:34"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700104
Only TIME
23:31:34
General datetime
1970-01-04 23:31:34Z
For Database
1970-01-04 23:31:34
For HTTP1.1
Sun, 04 Jan 1970 23:31:34 GMT