"Mon, 19 Jan 1970 00:40:20"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700119
Only TIME
00:40:20
General datetime
1970-01-19 00:40:20Z
For Database
1970-01-19 00:40:20
For HTTP1.1
Mon, 19 Jan 1970 00:40:20 GMT