"Wed, 11 Feb 1970 04:42:42"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700211
Only TIME
04:42:42
General datetime
1970-02-11 04:42:42Z
For Database
1970-02-11 04:42:42
For HTTP1.1
Wed, 11 Feb 1970 04:42:42 GMT