Julianator

Julianator

Julian Day of Year Calculator

105 ratings
26 reviews
#192 in paid Utilities
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$1.99 $0.99

Lowest price: $0.99 3 years ago (-0%)


Price history


Details

  • Released
  • Updated

Features

Julianator screenshot #1 for iPhone
Julianator screenshot #2 for iPhone
Julianator screenshot #3 for iPhone
Julianator screenshot #4 for iPhone
Julianator screenshot #5 for iPhone
Julianator screenshot #6 for iPhone
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About

Easily convert dates between the Gregorian calendar and the Julian Day of Year (ordinal date). This tool is useful for systems that use day-of-year numbering, such as mainframes, military, and food industries. It offers a clean interface, monthly views, and widgets for quick access.

Gregorian to Julian Day of Year conversion
Julian Day of Year to Gregorian conversion
Monthly calendar view
Home Screen widgets
Lock Screen widgets
Watch app with complications
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What's New in Julianator

4.7

September 18, 2025

Support for iOS 26 Liquid Glass

Charts

Top Paid

📊 192

Utilities

The app has maintained its position at 192 recently.

Last updated on July 21, 2026.

User reviews

Widget doesn’t work

The lock screen widget doesn’t work. The current Julian date should display in the icon without having to open app.

Fix widget

Is there a way to fix the widget. I want the see the actual Julian date with out clicking the widget. The widget displays “2024-2..”

Response from developer

This issue has been fixed in the latest release 4.4.

No complications

Does not show in the list of available complications. That’s what I wanted for.

Response from developer

It seems iOS 16.3 introduced some issue for some users on certain devices where the complications or widgets cannot be found. Please update Julianator to version 4.1 then open the app. You should be able to add complications or widgets. If any further assistance is needed please reach out to support@brightdaydigital.com.

Awesome!

I’m retired military, and work for the government as a civil servant. I use the Julian date daily, as many in the government do. I love this app! The fact that it has a watch complication and a iPhone widget, makes it absolutely perfect in my opinion.

The best

Amazing app, appreciate its simplicity. Use it in the aerospace industry all the time. Thanks to the developer for keeping it going all these years!

FAQ

What does the Julianator app do?

The Julianator app converts dates between the standard Gregorian calendar and the Julian Day of Year, also known as the ordinal date. This is useful for systems that track days sequentially within a year, often used in mainframe computing, military operations, and the food industry.

What are the key features of Julianator?

Key features include bidirectional date conversion (Gregorian to Julian Day of Year and vice versa), a clean interface with date pickers, a monthly view showing both calendar systems, and widgets for both the Home Screen and Lock Screen to display the current day of year. A companion Watch app is also available.

Is Julianator free to use?

Yes, the Julianator app is free to download and use. The provided information indicates it does not have ads or in-app purchases, suggesting a completely free experience for users.

What devices is Julianator compatible with?

The app is available for mobile devices, with specific mention of a Watch app for Apple Watch. Widgets are also available for both the Home Screen and Lock Screen, indicating compatibility with modern smartphone operating systems that support these features.

What is the difference between Julian Day of Year and the astronomical Julian Date?

This app specifically refers to the Julian Day of Year as the day-of-year number within the Gregorian calendar, also known as the ordinal date. It explicitly states that it does not use the astronomical definition of Julian Date, which is a count of days from a specific epoch in 4713 BC.