"Wed, 07 Jan 1970 04:40:40"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700107
Only TIME
04:40:40
General datetime
1970-01-07 04:40:40Z
For Database
1970-01-07 04:40:40
For HTTP1.1
Wed, 07 Jan 1970 04:40:40 GMT