"Mon, 19 Jan 1970 19:42:48"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700119
Only TIME
19:42:48
General datetime
1970-01-19 19:42:48Z
For Database
1970-01-19 19:42:48
For HTTP1.1
Mon, 19 Jan 1970 19:42:48 GMT