"Mon, 12 Jan 1970 12:31:49"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700112
Only TIME
12:31:49
General datetime
1970-01-12 12:31:49Z
For Database
1970-01-12 12:31:49
For HTTP1.1
Mon, 12 Jan 1970 12:31:49 GMT