"Mon, 12 Jan 1970 19:42:46"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700112
Only TIME
19:42:46
General datetime
1970-01-12 19:42:46Z
For Database
1970-01-12 19:42:46
For HTTP1.1
Mon, 12 Jan 1970 19:42:46 GMT