"Sun, 01 Feb 1970 04:34:34"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700201
Only TIME
04:34:34
General datetime
1970-02-01 04:34:34Z
For Database
1970-02-01 04:34:34
For HTTP1.1
Sun, 01 Feb 1970 04:34:34 GMT