"Thu, 01 Jan 1970 00:56:38"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700101
Only TIME
00:56:38
General datetime
1970-01-01 00:56:38Z
For Database
1970-01-01 00:56:38
For HTTP1.1
Thu, 01 Jan 1970 00:56:38 GMT