[until_date] Added one second on until_date search
The OAIPMH is precise to the second. Looking for an object with a modification date between 10:00:00.0000 and 10:00:00.0000 would miss all the data such as 10:00:00.01
The OAIPMH is precise to the second. Looking for an object with a modification date between 10:00:00.0000 and 10:00:00.0000 would miss all the data such as 10:00:00.01