Subject: Request to Add Jalali Shamsi Calendar to Any.do for Persian-Speaking Users

Dear Any.do Support Team,

I hope this message finds you well and working on exciting improvements for your amazing app. As a loyal Any.do user since 2018, I’ve always appreciated its simplicity and efficiency for managing tasks and schedules. However, I’ve noticed that for users like me in Iran and Persian-speaking communities, the absence of the Jalali Shamsi (Persian Solar) calendar creates a significant challenge. I’d like to share a few compelling reasons why adding this calendar would enhance the user experience and attract a large potential user base to Any.do.

First, let’s talk about the historical significance of the Jalali calendar. This calendar, one of the world’s oldest and most enduring scientific achievements, was developed in 1079 CE under the order of Jalaluddin Malikshah Seljuq, with contributions from scholars like Omar Khayyam in observatories in Isfahan, Ray, and Nishapur. Built upon the Sassanid Yazdegerdi calendar, its primary goal was to correct inaccuracies in earlier calendars to align precisely with agricultural seasons and the spring equinox. For over 950 years, it has remained the official calendar in Iran and serves as the basis for the Hijri Shamsi calendar in Afghanistan and Tajikistan. Adding it to Any.do would be like bringing a millennium of cultural heritage into a modern time-management tool, connecting users with our rich history.

Now, let’s discuss its unparalleled accuracy, which could elevate Any.do to new heights. The Jalali Shamsi calendar is based on the solar year (365.24219858 days) and uses an advanced leap-year system with both 4-year and 5-year cycles. Its precision is so remarkable that it has an error of just one day every 116,529 years (or, in more precise calculations, one day every 4,761,905 years)! In comparison, the Gregorian calendar (currently supported in Any.do) has an error of one day every 3,226 years. This means Persian users relying on the Shamsi calendar are always in sync with actual seasons, like Nowruz at the exact spring equinox, without worrying about date shifts. Imagine how valuable this would be for planning national holidays, seasonal events, or even agricultural/business tasks—no more manual date conversions!

Finally, the potential user base eagerly awaiting this feature is substantial. Over 110 million people worldwide speak Persian: approximately 70 million in Iran (over 85% of the population), 20 million in Afghanistan (about 60%), 8 million in Tajikistan (84%), and millions more in diaspora communities in the US, Europe, and Australia (e.g., over 700,000 Persian speakers in the United States). All these individuals use the Shamsi calendar daily and love tools like Any.do for managing their lives, but without Shamsi support, they often turn to alternative apps or manual conversions. Adding this calendar could attract millions of new users from this growing market (especially with increasing migration and digitalization) and position Any.do as a truly inclusive, global app.

In conclusion, this small change—likely compatible with your existing algorithms—could significantly boost loyalty among current users like me and establish Any.do as a leader in supporting local calendars. If you need technical details or beta testing with Persian-speaking users, I’d be happy to assist. I eagerly await your positive response!

Thank you very much,

[Reza]

Any.do User

Email: [reza1441@gmail.com]

Date: October 19, 2025 (equivalent to 27 Mehr 1404 Shamsi)