"Mon, 12 Jan 1970 15:19:51"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700112
Only TIME
15:19:51
General datetime
1970-01-12 15:19:51Z
For Database
1970-01-12 15:19:51
For HTTP1.1
Mon, 12 Jan 1970 15:19:51 GMT