"Wed, 07 Jan 1970 21:37:50"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700107
Only TIME
21:37:50
General datetime
1970-01-07 21:37:50Z
For Database
1970-01-07 21:37:50
For HTTP1.1
Wed, 07 Jan 1970 21:37:50 GMT