"Mon, 19 Jan 1970 20:42:45"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700119
Only TIME
20:42:45
General datetime
1970-01-19 20:42:45Z
For Database
1970-01-19 20:42:45
For HTTP1.1
Mon, 19 Jan 1970 20:42:45 GMT