"Sun, 01 Feb 1970 19:39:55"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700201
Only TIME
19:39:55
General datetime
1970-02-01 19:39:55Z
For Database
1970-02-01 19:39:55
For HTTP1.1
Sun, 01 Feb 1970 19:39:55 GMT