Date errors on openarchieven.nl [Helpdesk]

Over the last few days I have noticed that the dates shown on openarchieven.nl are consistently in error by 1 day.
This seems to be new. EVERY record I have viewed over the last 2 days has shown this error (including records which were previously correct).
The dates on the index page seem correct, but when opening the record the date is incorrect.
I have checked this against scans of the original records.As an example try searching "alphonsus adrianus martinus veltmans 1900" (my Opa).
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