"Mon, 19 Jan 1970 18:13:03"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700119
Only TIME
18:13:03
General datetime
1970-01-19 18:13:03Z
For Database
1970-01-19 18:13:03
For HTTP1.1
Mon, 19 Jan 1970 18:13:03 GMT