"Mon, 19 Jan 1970 20:42:49"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700119
Only TIME
20:42:49
General datetime
1970-01-19 20:42:49Z
For Database
1970-01-19 20:42:49
For HTTP1.1
Mon, 19 Jan 1970 20:42:49 GMT