Hi Jagan,
In order to use the climate model output directly in your crop model
(365  vs. 360 days), you would need to make the climate model run for
the complete 365 day cycle. You might want to contact the scientists who
wrote the RCM (PRECIS) and get the problem fixed. I would not recommend
any quick fix for this problem like adding another 5 days' data from
somewhere! This is not a logical solution.
I would also imagine that there can be a switch in the climate model to
toggle between 360 and 365 days and make re-runs.
Sasi


Saseendran S Anapalli,  Ph. D.
Crop Scientist
Agricultural Systems Research Unit
USDA-ARS
2150 D Center Ave.
Fort Collins, CO-80526


-----Original Message-----
From: DSSAT - Crop Models and Applications
[mailto:[log in to unmask]] On Behalf Of jagan TNAU
Sent: Friday, May 01, 2009 10:20 PM
To: [log in to unmask]
Subject: Calender issue for climate change study

Dear DSSAT users,

We have plans to do yield estimation using future climate change
scenario.
We have already downscaled  the GCM data using an RCM (PRECIS) for our
region. The climate change models use 30 days/month calender ie 360
days/year while DSSAT uses Gregorian calender. One option to overcome
this
is to keep the 360 days as Julian days and the remaining 5/6 days can be
copied from the 360th day keeping the rainfall alone as ZERO.

Is there any other specific methodology available to convert the 360
days
calender to Gregorian calender. Kindly help us to proceed further.

--
With regards

Dr.R.Jagannathan
Professor and Head
Agro Climate Research Centre,
Tamil Nadu Agricultural University,
Coimbatore - 641 003 India

PHONE: Off: 91-422-6611519 Res: 91-422-2453600
      Fax: 91-422-2430657 Mob: 91-94438 89891