"Mon, 19 Jan 1970 19:40:44"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700119
Only TIME
19:40:44
General datetime
1970-01-19 19:40:44Z
For Database
1970-01-19 19:40:44
For HTTP1.1
Mon, 19 Jan 1970 19:40:44 GMT