"Wed, 07 Jan 1970 20:40:39"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700107
Only TIME
20:40:39
General datetime
1970-01-07 20:40:39Z
For Database
1970-01-07 20:40:39
For HTTP1.1
Wed, 07 Jan 1970 20:40:39 GMT