Best Julian Date Apps

170+ iOS apps curated and reviewed

4.6 avg rating
16 free apps
Updated May 2026

Every iPhone needs a few good julian date apps. We benchmark 170+ of them on App Store rating, freshness, and pricing, then surface the standouts so you don't have to scroll the App Store yourself.

Top Picks for Julian Date

Julian - Quick Dates#1

Julian - Quick Dates by Juan Carlos Perez

Julian dates at a glance
Editor's Choice
🔧 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

This app provides a quick and efficient way to view and convert between 11 different types of dates, including standard Julian dates, Mars Sol dates, and Unix time. It features a calendar for easy navigation and allows copying dates to the clipboard. The current date can be displayed on the app icon and Apple Watch complications.

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
Julian Date#2

Julian Date by Jevon Charles

Strong Contender
📊 Productivity
4.8😊(2.7K ratings)
FreeIn-App Purchases
Julian Date screenshot 1
Julian Date screenshot 2
Julian Date screenshot 3

Convert between standard calendar dates and Julian dates. Supports 5-digit and full Julian date formats, including time. Also allows conversion from Julian dates back to calendar dates.

What We Love

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

Room to Improve

  • 🤔 Could be improved
  • 🤔 Good but...
  • 🤔 Good app
JulianDatr#3

JulianDatr by Partial Apps Corp

Optimize your time
Worth Considering
📊 Productivity
5.0(1 ratings)
Free
JulianDatr screenshot 1

Track the remaining days and weeks in the year. This simple tool helps you visualize your time and optimize your schedule. Stay aware of your progress and plan accordingly.

More Julian Date apps to explore

4
Julian Clock
Julian Clock
Julian Clock
by Adam Allard
$0.99

This utility app displays the current Julian Date, time with seconds, military date format, day of the week, and Zulu time (GMT). It's designed for quick access to essential timekeeping information.

Julian Date displayReal-time clock with secondsMilitary date format
🔧 Utilities
(15)
paid
5
Julianator
Julianator
Julianator
Julian Day of Year Calculator
$0.99
$1.99 | 50% OFF

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 conversionJulian Day of Year to Gregorian conversionMonthly calendar view
🔧 Utilities
(105)
free
6
Julian Calendar
Julian Calendar
Julian Calendar
Date Converter, Day Calculator
$1.99

View various Julian Calendar dates, including short, long, and reduced Julian Dates. Supports Lock Screen and Home Screen widgets for easy access to date conversions and calculations.

View Short Julian Calendar DateView Long Julian Calendar DateView Julian Date
📚 Education
(47)
paid
7
365 Days Calendar
365 Days Calendar
365 Days Calendar
Julian & day tracker
$1.99

This utility app converts between Julian and Gregorian dates and tracks Julian Day Numbers. It's designed for users in fields like astronomy, military operations, and historical research who need precise date management for daily operations.

Julian to Gregorian date conversionGregorian to Julian date conversionJulian Day Number tracking
🔧 Utilities
(23)
paid
8
JulianCal
JulianCal
JulianCal
Julian Day & Batch Codes
Free
🔧 Utilities
(0)
9
Date and Time Calculator
Date and Time Calculator
Date and Time Calculator
by 山 钟
Free

Calculate the exact number of days, hours, and seconds between any two dates. This tool also allows you to find the date before or after a specified period, making it useful for tracking deadlines, events, or financial products.

Calculate time between any two datesSecond-level precisionCalculate future dates
🔧 Utilities
(9.1K)
ad-supported
10
Calendar
Calendar
Calendar
by Apple Distribution International
Free

Organize your entire schedule in one place. View events from multiple accounts, manage tasks, and plan gatherings with others. Stay on top of appointments, holidays, and birthdays with customizable views and shared calendars.

Unified schedule viewEvent creation and editingTask management integration
📊 Productivity
(1.5M)
free
11
Date Converter: Calendars
Date Converter: Calendars
Date Converter: Calendars
Convert dates across calendars
Free

Easily convert dates between various calendar systems like Gregorian, Islamic, Coptic, and Hebrew. Features authentic month names and a modern, customizable interface for researchers, historians, and religious observers.

Convert between Gregorian, Islamic, Coptic, Um Al Qura, Hebrew, and Solar Hijri calendarsAuthentic month names for each calendar systemIntuitive, modern Material Design 3 interface
🔧 Utilities
(65)
free with in-app purchases
12
LSTclock: sidereal time clock
LSTclock: sidereal time clock
LSTclock: sidereal time clock
Local sidereal time clock
Free

This utility app displays local sidereal time for registered locations on iOS, iPadOS, and watchOS. It can also calculate sidereal time and Julian Date for any date and time, and sync locations between devices.

Local sidereal time displayJulian Date calculationSupports multiple registered locations
🔧 Utilities
(10)
free
13
Sky Time
Sky Time
Sky Time
by John Kennedy
Free

This app provides essential astronomy-related time data, including Julian Date, Universal Time, and Sidereal Time calculated using your device's location. It features a night-vision friendly red display and pop-up descriptions for easy understanding.

Displays local, Julian, Local Sidereal, and Universal TimeCalculates Sidereal Time using device locationNight-vision friendly red display
🔍 Reference
(17)
free
14
Quick Family Tree
Quick Family Tree
Quick Family Tree
Easily make it with a tap.
Free

Easily create and manage your family history with an intuitive interface. This app allows you to build interactive family trees without an account or paid services. Streamline complex relationships and visualize your ancestry with ease.

Create family trees without an accountForm relationships easily by tappingStreamline complex family trees with central display
🔧 Utilities
(749)
free with in-app purchases
15
The Date Calculator PRO
The Date Calculator PRO
The Date Calculator PRO
Calculate days between dates
Free

Easily calculate the duration between two dates, with or without accounting for the time of day. You can also add or subtract various time units from a specific date. The results are automatically converted into multiple units for your convenience.

Calculate duration between two datesInclude time of day in calculationsAdd/subtract years, months, weeks, days
🔧 Utilities
(2.5K)
free with in-app purchases
16
BigDate
BigDate
BigDate
No squinting to see the date
Free
🔧 Utilities
(0)
17
Dates Convert
Dates Convert
Dates Convert
Convert dates in any calendar
Free

Easily convert dates between various calendar systems, including Gregorian, Persian, Islamic, Hebrew, Japanese, and Indian. Calculate the time difference between any two dates with a simple and intuitive interface.

Date conversion between multiple calendarsCalculate date differencesSupports Gregorian, Persian, Islamic, Hebrew, Japanese, Indian calendars
📚 Education
(0)
free with in-app purchases
18
Convert Date
Convert Date
Convert Date
by Fahad Alrashidi
Free

Easily convert dates between various calendar systems including Islamic, Gregorian, Hebrew, and more. Calculate age and access a history of your conversions. Share results as images.

Multiple calendar conversionsAge calculationConversion history
🔧 Utilities
(12)
free with in-app purchases
19
TrumpTime Date Calculator
TrumpTime Date Calculator
TrumpTime Date Calculator
Trump's time in office
Free

Calculate the duration of a presidential term, including elapsed days, remaining days, and future projections. It also functions as a general date calculator for any two dates or time periods.

Calculate elapsed and remaining presidential term daysProject future term lengthsGeneral date calculator for any two dates
🔧 Utilities
(799)
free
20
Love Horoscopes
Love Horoscopes
Love Horoscopes
Horoscope, Astrology & Tarot
Free

Decode your romantic destiny with daily love forecasts, compatibility reports, and diverse tarot readings. Navigate relationships with confidence using astrological insights and personalized guidance.

Daily love forecastsTarot and fortune teller suiteCompatibility and chemistry analysis
🌟 Lifestyle
(893)
free with in-app purchases

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