The Met Ocean Domain Working Group of OGC is now approaching its 5th birthday - it was established in 2009 at the OGC Athens Technical Committee, transformed itself from just 'Meteorology' to 'Meteorology & Oceanography', and persuaded everyone that Climatology is a subset, so did not need a separate interest group like Hydrology.
Suppose you are interested in displaying, or processing, international historical data from some period in the last few centuries using OGC Map Services or other standards. Scanning the available data, you or volunteers or legions of underpaid students have extracted some interesting series of data. And you realise that some of the data is labelled 10, 11, 12 or even 13 days out. This is because various countries switched their calendars from the Julian calendar, established by the Roman emperor, Julius Caesar, to the