Combining Gregorian and non-Gregorian Dates
Displaying both Gregorian and non-Gregorian dates in the same minicalendar is easy. The trick is that you actually create 2 textboxes each containing a minicalendar, and superimpose them so that visually it looks like all the dates are in the same minicalendar.
Take the example of displaying both Gregorian dates and Chinese dates in the same minicalendar. We use 2 textboxes, each containing a minicalendar, one Gregorian one on the left and a Chinese Minicalendar on the right :

to obtain the following superimposed result in the GridTemplate, and result in the output file :

The same can be done for the Muslim, Jewish and Hindiminicalendars.