"Sun, 01 Feb 1970 19:42:40"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700201
Only TIME
19:42:40
General datetime
1970-02-01 19:42:40Z
For Database
1970-02-01 19:42:40
For HTTP1.1
Sun, 01 Feb 1970 19:42:40 GMT