"Mon, 12 Jan 1970 15:06:44"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700112
Only TIME
15:06:44
General datetime
1970-01-12 15:06:44Z
For Database
1970-01-12 15:06:44
For HTTP1.1
Mon, 12 Jan 1970 15:06:44 GMT