"Mon, 12 Jan 1970 20:37:49"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700112
Only TIME
20:37:49
General datetime
1970-01-12 20:37:49Z
For Database
1970-01-12 20:37:49
For HTTP1.1
Mon, 12 Jan 1970 20:37:49 GMT