Strange time axis inconsitencies...

[strandwg@xxxxxxxx (Gary Strand)]

I've got 300 years of monthly model run data that I've put into netCDF. For
some strange reason, the time axis appears to be "slipping" as seen by FERRET.

For example:

      Time stamp     Years since start
   1: 16-JAN-0001    0.0417
   2: 15-FEB-0001    0.1250
   3: 18-MAR-0001    0.2083
   4: 17-APR-0001    0.2917
   5: 17-MAY-0001    0.3750
   6: 17-JUN-0001    0.4583
   [....]
3596: 06-JUN-0300  299.6250
3597: 06-JUL-0300  299.7083
3598: 05-AUG-0300  299.7917
3599: 05-SEP-0300  299.8750
3600: 05-OCT-0300  299.9583

How come the last time in calendar form is off by ~75 days, despite the fact
that the delta T is correct? I know that in 300 years there's 75 leap days,
but the last column takes that into account.

Here's the netCDF specification of the time axis:

        double time(time) ;
                time:long_name = "time" ;
                time:units = "years since 0001-01-01" ;

Thanks for any help anyone can offer.
--
Gary Strand
strandwg@ucar.edu                          http://www.cgd.ucar.edu/ccr/strandwg