"Wed, 07 Jan 1970 21:38:07"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700107
Only TIME
21:38:07
General datetime
1970-01-07 21:38:07Z
For Database
1970-01-07 21:38:07
For HTTP1.1
Wed, 07 Jan 1970 21:38:07 GMT