"Sun, 18 Jan 1970 07:44:46"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700118
Only TIME
07:44:46
General datetime
1970-01-18 07:44:46Z
For Database
1970-01-18 07:44:46
For HTTP1.1
Sun, 18 Jan 1970 07:44:46 GMT