Best Astronomical Date App

219+ iOS apps curated and reviewed

4.6 avg rating
15 free apps
Updated June 2026

Julian Date is the household name in astronomical date app, but it's far from the only option. We track 219+ alternatives and competitors on iOS — many free, many higher-rated than you'd expect.

Top Picks for Astronomical Date App

Julian Date#1

Julian Date by Jevon Charles

Editor's Choice
📊 Productivity
4.8😊(2.7K ratings)
FreeIn-App Purchases
Julian Date screenshot 1
Julian Date screenshot 2
Julian Date screenshot 3

What We Love

  • 🚀 Best Julian Date App
  • 👍 Great
  • 👍 Love this APP
  • 👍 Military

Room to Improve

  • 🤔 Could be improved
  • 🤔 Good but...
  • 🤔 Good app
Julian - Quick Dates#2

Julian - Quick Dates by Juan Carlos Perez

Julian dates at a glance
Strong Contender
🔧 Utilities
4.8😊(4K ratings)
FreeIn-App Purchases
Julian - Quick Dates screenshot 1
Julian - Quick Dates screenshot 2
Julian - Quick Dates screenshot 3
Julian - Quick Dates screenshot 4

Julian - Quick Dates provides a convenient way to view and copy 11 different date formats with a built-in calendar for easy reference. It also offers the option to display the current date on the badge icon and supports various watch face complications for Apple Watch users. Experience efficient date management with Julian today!

What We Love

  • 🚀 Excellent for work/professional use
  • 👍 Simple and easy to use
  • 👍 Helpful for daily tasks
  • 👍 Convenient complication on Apple Watch

Room to Improve

  • 🐛 Complication issues on Apple Watch (not updating, getting stuck)
  • 🐛 Date discrepancies between app and complication
  • 🐛 App not functioning properly after updates
Hijri Cal التقويم الهجري#3

Hijri Cal التقويم الهجري by Ramy Gamal

Hijri Converter, Simplified!
Worth Considering
📊 Productivity
4.6😊(798 ratings)
FreeIn-App Purchases
Hijri Cal التقويم الهجري screenshot 1
Hijri Cal التقويم الهجري screenshot 2
Hijri Cal التقويم الهجري screenshot 3
Hijri Cal التقويم الهجري screenshot 4
Hijri Cal التقويم الهجري screenshot 5

Convert Gregorian to Hijri dates seamlessly with the Hijri Cal app. Includes widgets for on-the-go conversion, Arabic support, Islamic event tracking, and a unique Hijri Date Adjustment feature. Try it free for 7 days and upgrade for enhanced features.

What We Love

  • 👍 Beautifully designed app
  • 🚀 Many nice options
  • 🚀 Useful and recommended
  • 👍 Practical and helpful

Room to Improve

  • 🐛 Dates not fully accurate compared to Gregorian calendar
  • 🔒 Certain features require paid subscription
  • 🐛 Widget not working properly after update

More Astronomical Date App apps to explore

4
Timepage: Calendar Planner
Timepage: Calendar Planner
Timepage: Calendar Planner
Weather & Family Appointments
Free

A revolutionary smart calendar app that combines events, maps, contacts, and weather to make your days more productive. Enjoy intuitive design, travel time estimates, animated forecasts, and seamless integration with various calendars. Try it now for a more organized life!

📊 Productivity
(15K)
5
Convert Date
Convert Date
Convert Date
by Fahad Alrashidi
Free

This application allows users to convert dates between various calendars and calculate their age, with the added features of storing a history of conversions and sharing results as images. Try converting dates and exploring its features today!

🔧 Utilities
(12)
6
Atomic Clock PRO
Atomic Clock PRO
Atomic Clock PRO
Exact Time Digital and Analog
Free

This app offers exact time from an atomic clock, automatically recognizes your time zone, allows personal background images, and lets you switch between digital and analogue clocks by swiping. Available for iPhone and iPad. Download now for free!

🔧 Utilities
(9.8K)
7
iCalendar
iCalendar
iCalendar
Schedule your day colorfully
$2.99

An essential calendar app for iOS devices, iCalendar helps users stay organized and productive with seamless event entry, color-coding, task management, and time zone support. With features like drag-and-drop scheduling, customizable alerts, and Google Calendar sync, iCalendar offers a comprehensive scheduling experience for users. Visit http://www.symfonies.com/icalendar/ for more information and features.

📊 Productivity
(5.3K)
8
Islamic Calendar - التقويم الإسلامي
Islamic Calendar - التقويم الإسلامي
Islamic Calendar - التقويم الإسلامي
by i4islam
Free

This application is an Islamic calendar used to date events and determine Islamic holy days and festivals. Features include new graphics, date conversion, moon phase info, and display of major Islamic events. A more advanced version, Islamic Calendar Pro, is also available.

🔧 Utilities
(261)
9
Date Calendar Calculator
Date Calendar Calculator
Date Calendar Calculator
Calculate Calendar Date & Time
Free

This application helps users perform various date and time calculations, including finding durations between dates, calculating working days, converting between calendars and time zones, and estimating ovulation and pregnancy due dates. Download it today to access a comprehensive set of tools with a simple and intuitive design.

🔧 Utilities
(28)
10
Julianator
Julianator
Julianator
Julian Day of Year Calculator
$0.99
$1.99 | 50% OFF

This app converts dates between Julian Day of Year and Gregorian calendars, allowing users to easily switch between the two formats. With a simple and clean interface, users can convert dates in both directions, view monthly calendars, and access widgets and a Watch app for added convenience.

🔧 Utilities
(48)
11
Time + Date Calculator
Time + Date Calculator
Time + Date Calculator
Best tool to work with time
$0.99

Utilize the ultimate Time and Date Calculator app for seamless time management. Calculate time differences, workdays, add/subtract time, convert between various units, predict future dates, manage time zones, determine your age, and plan trips efficiently. Download now for enhanced productivity.

🔧 Utilities
(944)
12
World Time Clock Master
World Time Clock Master
World Time Clock Master
Zulu Time Converter & Widget
Free

Track time zones across the globe effortlessly with our app. Convert and compare different time zones quickly with Time Master: World Clock. Time management made easy!

🔧 Utilities
(688)
13
Tiny Calendar Pro
Tiny Calendar Pro
Tiny Calendar Pro
Calendar App: Planner & Tasks
$19.99

A versatile calendar app designed to streamline your planning and organization needs. Sync schedules, set reminders, and manage events effortlessly. Stay on top of your agenda with Tiny Calendar Pro!

📊 Productivity
(2.3K)
14
Count (Date Calculator)
Count (Date Calculator)
Count (Date Calculator)
by JungHoon Noh
Free

This date calculator helps you find answers to questions like "how many days until a specific event?" or "what's the date a certain number of days from now?". With simple touch and move gestures, you can easily set a base date, calculate, and switch between different modes to get the answers you need.

🌟 Lifestyle
(9)
15
Days + Date + Time Calculator
Days + Date + Time Calculator
Days + Date + Time Calculator
Days Between Two Dates
Free

Calculate the number of days, duration between dates, and time intervals with this versatile application. Easily determine the days, dates, and times between two points - Try it now!

📊 Productivity
(795)
16
Sky Tonight - Stargazing Guide
Sky Tonight - Stargazing Guide
Sky Tonight - Stargazing Guide
Constellation Star Finder App
Free

Explore the sky with a customizable stargazing app that helps you identify celestial objects, plan for astronomical events, and set up personalized reminders. Features include real-time sky map, augmented reality mode, customizable constellation views, flexible search, event reminders, astronomy calendar, and Premium Access for unlimited functionality. Take your stargazing to new heights with this all-in-one astronomy guide.

🔍 Reference
(73K)
17
Date Wheel date calculator
Date Wheel date calculator
Date Wheel date calculator
by Creative Algorithms
$4.99

The Date Wheel date calculator is an award-winning mobile application that allows users to easily calculate the time between two dates in various units, including months, weeks, days, and business days. It offers features like saving calculations, locking preferred areas, and tracking important events and milestones, making it a versatile tool for both personal and business use. Try the free web version at http://datewheel.net to experience its functionality.

💼 Business
(95)
18
Time & Date Calculator
Time & Date Calculator
Time & Date Calculator
Perform calculations with time
Free

Track","description":"TimeTrack is a versatile time management app that helps users track their daily activities, set goals, and analyze productivity. With features like customizable timers, detailed activity logs, and productivity reports, TimeTrack is the perfect tool for improving efficiency and time management. Download now to start maximizing your productivity!"}```

🔧 Utilities
(66)
19
Time Calculator - Work Hours
Time Calculator - Work Hours
Time Calculator - Work Hours
Date, Calendar & Salary Clock
Free

An app designed to streamline work hours calculations, helping users track their time with precision. Simplify your scheduling and stay organized effortlessly with Time Calculator⁺.

🔧 Utilities
(2.4K)
20
Date Converter: Calendars
Date Converter: Calendars
Date Converter: Calendars
Convert dates across calendars
Free

This application allows users to easily convert dates between multiple calendar systems, including Gregorian, Islamic, Coptic, and more. With a user-friendly interface and customizable features, it's perfect for researchers, historians, and anyone working with different calendars, helping them navigate and synchronize dates across cultures with ease.

🔧 Utilities
(65)