Julianator

Name: Julianator
Price: 0.99 USD
Rating: 4.7 (111 reviews)
Author: Bright Day Digital LLC

Julian Day of Year Calculator

111 ratings

27 reviews

#81 in paid Utilities

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$1.99 $0.99

Lowest price: $0.99 4 years ago (-0%)

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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

📈 81+81

Utilities

This app rose +81 positions in Utilities chart.

Last updated on August 11, 2026.

User reviews

Most Recent Highest Rated Lowest Rated

Still does not handle leap years

This app still does not handle Dec. 31 at the end of leap years.

Beckett II

2 months ago

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.

FiveftGiant

2 years ago

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..”

slickp35

2 years ago

No complications

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

TimTimpani

4 years ago

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.

CPUSAF

no / noADS

no / noIn-App Purchase

$0.99 / freePrice

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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.