"Sun, 18 Jan 1970 07:49:07"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700118
Only TIME
07:49:07
General datetime
1970-01-18 07:49:07Z
For Database
1970-01-18 07:49:07
For HTTP1.1
Sun, 18 Jan 1970 07:49:07 GMT