"Sun, 01 Feb 1970 00:40:05"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700201
Only TIME
00:40:05
General datetime
1970-02-01 00:40:05Z
For Database
1970-02-01 00:40:05
For HTTP1.1
Sun, 01 Feb 1970 00:40:05 GMT