Hi all, I'm trying to understand how to handle some climate data with a 360-day calendar. As I understand it (http://cf-pcmdi.llnl.gov/documents/cf-conventions/1.4/cf-conventions.ht ml#calendar), this calendar uses 12-month years with exactly 30 days each. I have a few questions:
1) In this system, how long is a day in milliseconds? Is it the normal 24*60*60*1000? Or is it somehow scaled so that a year of 360 days has the same number of milliseconds as an "average" Gregorian year? 2) Is there any way of translating (even roughly) between 360-day and Gregorian calendars? E.g. perhaps one could, for a given date-time, calculate the fraction of a year that has elapsed and apply this in the conversion? Or is the comparison only meaningful in a statistical sense (e.g. annual/seasonal averages)? 3) Would the most usual way to encode a CF time axis in a 360-day calendar be to use "days since..."? I guess if a day has a standard length in (milli)seconds then one could also safely use "seconds since..."? 4) Finally on practical note: I seem to remember that someone has implemented the 360-day calendar using the Java library joda-time? Is this code available for re-use? Thanks in advance, Jon -- Dr Jon Blower Technical Director, Reading e-Science Centre Environmental Systems Science Centre University of Reading Harry Pitt Building, 3 Earley Gate Reading RG6 6AL. UK Tel: +44 (0)118 378 5213 Fax: +44 (0)118 378 6413 [email protected] http://www.nerc-essc.ac.uk/People/Staff/Blower_J.htm _______________________________________________ CF-metadata mailing list [email protected] http://mailman.cgd.ucar.edu/mailman/listinfo/cf-metadata
