"Mon, 19 Jan 1970 15:20:36"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700119
Only TIME
15:20:36
General datetime
1970-01-19 15:20:36Z
For Database
1970-01-19 15:20:36
For HTTP1.1
Mon, 19 Jan 1970 15:20:36 GMT