"Sat, 17 Jan 1970 00:28:28"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700117
Only TIME
00:28:28
General datetime
1970-01-17 00:28:28Z
For Database
1970-01-17 00:28:28
For HTTP1.1
Sat, 17 Jan 1970 00:28:28 GMT