Best Ancient Calendar Apps

Kemetic Calendar

The Sidereal Calendar

Free

Explore humanity's oldest calendar, based on the heliacal rising of Sirius. This app syncs with your phone, allows event scheduling, and educates on Divinities and Holy Days. Reconnect with ancient culture through astronomical accuracy.

Attic Calendar

Ancient Greek Calendar

Free

Explore the ancient Athenian calendar with this app. Track solstices, equinoxes, moon phases, and ancient Greek festivals. Features include customizable widgets for at-a-glance viewing and detailed calculation rules for historical accuracy.

Calendar : 4500 BC to 4500 AD

Calculate the day of the week

$1.99

This app calculates the day of the week for any date between 4500 BC and 4500 AD. It also displays moon phases and planet positions, with features available in 30 languages. Includes Julian Date, Islamic, Chinese, and Korean calendars.

UniCal - Calendar Converter

Universal Calendar Converter

Free

Explore historical and cultural dates across numerous global calendars. Convert any date to Gregorian, Hebrew, Islamic, Chinese, Maya, and many more. Get daily alerts for celebrations and saints.

Maya Calendar

by Edwin Barnhart

Free

$0.99 | 100% OFF

Explore the ancient Maya calendar and its connection to the Gregorian calendar. Calculate dates, discover personality traits based on your Maya birthday, and learn about Maya history and time cycles. This app works offline, making it perfect for travel and study.

Khmer Calendar +

Khmer Lunar Calendar

Free

This app blends traditional Khmer lunar dates with smart reminders and cultural insights for daily planning. It offers moon phases, holidays, and custom notifications, all within a private, ad-free experience during sacred times.

Enoch Calendar

The Original Bible Calendar

Free

$3.99 | 100% OFF

This app presents an ancient 364-day solar calendar based on the Book of Enoch and Dead Sea Scrolls. It features precise date tracking for feasts, Sabbaths, and seasonal markers, with historical biblical events and personal event integration.

HANOK 364 Day Calendar

HANOK Calendar

Free

This app presents a 12-month solar calendar with 364 days, based on ancient texts. It details historical calendar usage and its significance in religious and cultural contexts.

Ancient slavic calendar

Ancient slavic calendar

Free

Explore the ancient Slavic calendar system, known as Krugolet. Understand its hexadecimal calculations, 16-year cycles, and the 144-year Circle of Life. Discover its historical context and how it differs from the modern calendar.

Cyrus Calendar

تقویم شاهنشاهی کوروش کبیر

Free

This app offers a calendar rooted in ancient Persian history, starting from the reign of Cyrus the Great. It emphasizes national identity and cultural heritage, aligning with the scientific accuracy of the Jalali calendar.

Calendar - 2026

2026 Calendar Planner,Reminder

Free

This daily planner and reminder app helps you organize tasks, meetings, and events with customizable views and notifications. It offers to-do lists, checklists, and the ability to add locations and notes to your schedule.