"Mon, 19 Jan 1970 23:38:02"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700119
Only TIME
23:38:02
General datetime
1970-01-19 23:38:02Z
For Database
1970-01-19 23:38:02
For HTTP1.1
Mon, 19 Jan 1970 23:38:02 GMT