"Sun, 18 Jan 1970 00:09:44"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700118
Only TIME
00:09:44
General datetime
1970-01-18 00:09:44Z
For Database
1970-01-18 00:09:44
For HTTP1.1
Sun, 18 Jan 1970 00:09:44 GMT