"Wed, 07 Jan 1970 20:40:23"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700107
Only TIME
20:40:23
General datetime
1970-01-07 20:40:23Z
For Database
1970-01-07 20:40:23
For HTTP1.1
Wed, 07 Jan 1970 20:40:23 GMT