I have never seen anywhere such a system,
but in KDE 4.4, in which Indian Calendar system
can be choose at Desktop system.
In kde, choose systemsettings->Regional & Language
->Language-> Time and Date.
There is Indian Calendar, so after login and logout,
you can check it.
Following image has enough detail about it.
KDE 4.4 with Phalgun Month
Day: Som (Monday)
with time, software becoming more useful and more
close not only to hi-fi people, but general public.
After all those are for them, by them.