"Wed, 18 Mar 1970 12:03:06"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700318
Only TIME
12:03:06
General datetime
1970-03-18 12:03:06Z
For Database
1970-03-18 12:03:06
For HTTP1.1
Wed, 18 Mar 1970 12:03:06 GMT