"Wed, 07 Jan 1970 04:39:08"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700107
Only TIME
04:39:08
General datetime
1970-01-07 04:39:08Z
For Database
1970-01-07 04:39:08
For HTTP1.1
Wed, 07 Jan 1970 04:39:08 GMT