Index: /issm/trunk-jpl/src/m/contrib/morlighem/ismip6/date2decyear.m
===================================================================
--- /issm/trunk-jpl/src/m/contrib/morlighem/ismip6/date2decyear.m	(revision 24068)
+++ /issm/trunk-jpl/src/m/contrib/morlighem/ismip6/date2decyear.m	(revision 24068)
@@ -0,0 +1,30 @@
+function decyear = date2decyear(datein)
+%DATE2DECYEAR - convert date to decimal year (for ISSM)
+%
+%   input argument must be a serial date (see datenum)
+%
+%   Usage:
+%      year = date2decyear(datein)
+%
+%   Example:
+%      year = date2decyear(datenum('19-May-2000'))
+
+
+%Make table from date coming in
+timevec = datevec(datein);
+
+%Set everything in the date vector to 0 except for the year
+%to compute the date for the beginninf of the year
+timevec(:,2:end) = 0;
+dateYearBegin = datenum(timevec);
+
+%Compute date of end of year
+timevec2 = timevec;
+timevec2(:,1) = timevec2(:,1) + 1;
+dateYearEnd = datenum(timevec2);
+
+%Calculate the day of the year
+doy = datein - dateYearBegin;
+
+%Finally, we can create the decimal year time
+decyear =  timevec(:,1) + (doy - 1) ./ (dateYearEnd - dateYearBegin);
Index: /issm/trunk-jpl/src/m/contrib/morlighem/ismip6/decyear2date.m
===================================================================
--- /issm/trunk-jpl/src/m/contrib/morlighem/ismip6/decyear2date.m	(revision 24068)
+++ /issm/trunk-jpl/src/m/contrib/morlighem/ismip6/decyear2date.m	(revision 24068)
@@ -0,0 +1,23 @@
+function dateout = decyear2date(decyear)
+%DECYEAR2DATE - converts decimal year to serial date
+%
+%   Usage:
+%      dateout = decyear2date(decyear)
+%
+%   Example:
+%      dateout = decyear2date(2011.001)
+
+
+%Get year
+year = floor(decyear);
+fraction = mod(decyear,1);
+
+%Get date of beginning and end of year
+date0 = datenum(num2str(year),'yyyy');
+date1 = datenum(num2str(year+1),'yyyy');
+
+%Compute number of days in year
+numdays = date1 - date0;
+
+%Compute date
+dateout= date0 + fraction * numdays;