(edit: I can't count, it looks like it IS 365 days).
Saltha's calendar has 14 months each with 5 weeks and each week with 5 days, and then a 15th month with 15 days that are out of the year. So basicly being able to set # of days in a week would make this work. Also, setting 1st/last day of the year so it doesn't have to be Jan 1st.