Michael,

I did make a type in that 1/1/1385 = 3/20/2006.

The calendar consists of 12 months, the first six of which are 31 days,
the next five 30 days, and the final month 29 days in a normal year and
30 days in a leap year. As one of the few calendars designed in the era
of accurate positional astronomy, the Persian calendar uses a very
complex leap year structure which makes it the most accurate solar
calendar in use today. Years are grouped into cycles which begin with
four normal years after which every fourth subsequent year in the cycle
is a leap year. Cycles are grouped into grand cycles of either 128 years
(composed of cycles of 29, 33, 33, and 33 years) or 132 years,
containing cycles of of 29, 33, 33, and 37 years. A great grand cycle
is composed of 21 consecutive 128 year grand cycles and a final 132
grand cycle, for a total of 2820 years. The pattern of normal and leap
years which began in 1925 will not repeat until the year 4745!

Each 2820 year great grand cycle contains 2137 normal years of 365 days
and 683 leap years of 366 days, with the average year length over the
great grand cycle of 365.24219852. So close is this to the actual solar
tropical year of 365.24219878 days that the Persian calendar accumulates
an error of one day only every 3.8 million years. As a purely solar
calendar, months are not synchronised with the phases of the Moon.