"Mon, 19 Jan 1970 15:13:04"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700119
Only TIME
15:13:04
General datetime
1970-01-19 15:13:04Z
For Database
1970-01-19 15:13:04
For HTTP1.1
Mon, 19 Jan 1970 15:13:04 GMT