"Sat, 14 Feb 1970 18:11:51"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700214
Only TIME
18:11:51
General datetime
1970-02-14 18:11:51Z
For Database
1970-02-14 18:11:51
For HTTP1.1
Sat, 14 Feb 1970 18:11:51 GMT