"Mon, 19 Jan 1970 04:42:19"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700119
Only TIME
04:42:19
General datetime
1970-01-19 04:42:19Z
For Database
1970-01-19 04:42:19
For HTTP1.1
Mon, 19 Jan 1970 04:42:19 GMT