"Mon, 19 Jan 1970 14:44:30"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700119
Only TIME
14:44:30
General datetime
1970-01-19 14:44:30Z
For Database
1970-01-19 14:44:30
For HTTP1.1
Mon, 19 Jan 1970 14:44:30 GMT