"Sat, 21 Feb 1970 14:46:00"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700221
Only TIME
14:46:00
General datetime
1970-02-21 14:46:00Z
For Database
1970-02-21 14:46:00
For HTTP1.1
Sat, 21 Feb 1970 14:46:00 GMT