"Sun, 15 Feb 1970 14:46:11"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700215
Only TIME
14:46:11
General datetime
1970-02-15 14:46:11Z
For Database
1970-02-15 14:46:11
For HTTP1.1
Sun, 15 Feb 1970 14:46:11 GMT