"Sun, 01 Feb 1970 18:15:01"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700201
Only TIME
18:15:01
General datetime
1970-02-01 18:15:01Z
For Database
1970-02-01 18:15:01
For HTTP1.1
Sun, 01 Feb 1970 18:15:01 GMT