"Sat, 03 Jan 1970 00:56:57"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700103
Only TIME
00:56:57
General datetime
1970-01-03 00:56:57Z
For Database
1970-01-03 00:56:57
For HTTP1.1
Sat, 03 Jan 1970 00:56:57 GMT