# 365 Days Calendar — Julian & day tracker > Julian and Gregorian date converter and Julian Day Number tracker. (iPhone/iPad app by Cyberdeploy Inc..) - Source: https://appshunter.io/ios/app/365-days-calendar/id6446790328 (this page in markdown: same URL + `.md`) - Developer: [Cyberdeploy Inc.](https://appshunter.io/developer/1679092362) - Category: Utilities, Productivity - Price: $1.99 - Rating: 4.70/5 from 26 App Store ratings · 7 written reviews indexed - Age rating: 4+ - Requires: iOS 17.6 · 6 MB - Languages: American English - Released: 2023-03-27 - Data updated: 2026-08-02 - Monetization: paid - User reviews in markdown: https://appshunter.io/ios/app/365-days-calendar/id6446790328/reviews.md ## What is 365 Days Calendar? The Julian Date Calendar App is a simple yet powerful tool for converting between Julian and Gregorian dates, tracking Julian Day Numbers (JDN), and managing historical or scientific date references. Whether you're working in astronomy, military operations, food production, or historical research, this app offers accurate and efficient support for daily operations, all with a user-friendly experience. ## Key features - Julian to Gregorian date conversion - Gregorian to Julian date conversion - Julian Day Number tracking - Historical date reference management - Scientific date reference management - User-friendly interface ## Recent user reviews (7 of 7) All indexed reviews: https://appshunter.io/ios/app/365-days-calendar/id6446790328/reviews.md ### 5/5 — Day tracking *2025-12-15* I like to keep abreast of the number of days left in the year. Your calendar does that. Thank you ### 5/5 — Great tool *2025-11-04* Use it almost daily **Developer response:** I’m glad you found it useful. Thanks a lot for the feedback ### 3/5 — Widget Creation *2025-09-05* This is helpful, but it would be perfect if there was a widget that I could quickly glance and see “Day 248/365, Week 36” or something of the sort.. there’s literally no app on the entire App Store like that 😵‍💫 **Developer response:** Thank you for your feedback. I have now just released a new version with Home Screen lock screen widgets 🙏 ### 3/5 — Week Number *2025-08-15* It would be nice if these calendars also had the week numbers alongside the Gillian date so you know what week you are in. **Developer response:** Thanks for the feedback. I have added the week number to the calendar now ### 5/5 — Solid *2025-07-15* Simple and effective **Developer response:** Thank you. Glad you liked the app ### 5/5 — Perfect for what I need *2025-07-03* The only thing that would make it better is an option to enable a notification badge on the app that shows the Julian date ### 5/5 — It oka *2025-06-24* For lack of better **Developer response:** Thanks for your feedback. I love to hear more from you what you would like to see in the future versions. thank you ## Frequently asked questions about 365 Days Calendar ### What is the price of 365 Days Calendar? 365 Days Calendar is a paid app priced at $1.99. This one-time purchase grants you access to all its features without any recurring fees. ### Does 365 Days Calendar have ads? No, 365 Days Calendar is ad-free. You can use all its functionalities without any interruptions from advertisements. ### What devices is 365 Days Calendar compatible with? 365 Days Calendar is available for iPhone and iPad devices. It is designed to work seamlessly on Apple's mobile operating systems. ### How often is 365 Days Calendar updated? The latest version, 2.0.0, was released on 2026-01-10, indicating recent development activity. Users can expect ongoing support and potential future updates. ### What is the age rating for 365 Days Calendar? 365 Days Calendar has an age rating of 4+. This means it is suitable for users of all ages, with no content restrictions. ### What is the Julian Date Number (JDN)? The Julian Day Number (JDN) is a continuous count of days and fractions of a day since the beginning of the Julian period. 365 Days Calendar helps you accurately track and convert to this system. ### What are the main use cases for 365 Days Calendar? This app is ideal for astronomy, military operations, food production, and historical research where precise date conversions and tracking are essential for operations and analysis. ## Version history (last 5 releases) ### 2.0.0 — 2026-01-10 New feature added to track events and countdown Now you can create events and make them as normal events or countdowns ### 1.0.9 — 2025-12-27 Minor UI clean up for more readability Compiled for latest iOS (26) ### 1.0.8 — 2025-10-26 Bug fix on inputting nth day caused selecting a wrong year ### 1.0.7 — 2025-10-24 It is a complete re-write of the app with iOS native language Swift. App now has lock screen widget and home screen widget. ### 1.0.5 — 2025-09-01 We have added week numbers to the calendar ## Apps similar to 365 Days Calendar | App | Rating | Price | Category | | --- | --- | --- | --- | | [Jonny Stein Dates](https://appshunter.io/ios/app/jonny-stein-dates/id6504141055) | — | Free | Utilities | | [DaterMe](https://appshunter.io/ios/app/daterme/id1013502066) | — | $4.99 | Utilities | | [Astrodate](https://appshunter.io/ios/app/astrodate/id308461774) | 1.0 (1) | $0.99 | Utilities | | [Julianator](https://appshunter.io/ios/app/julianator/id383950353) | 4.7 (111) | $0.99 | Utilities | | [fCalendar](https://appshunter.io/ios/app/fcalendar/id348590162) | 3.9 (28) | $1.99 | Utilities | | [International Fixed Calendar](https://appshunter.io/ios/app/international-fixed-calendar/id1107327564) | 3.0 (9) | Free | Utilities | ## More apps by Cyberdeploy Inc. - [MyNumber](https://appshunter.io/ios/app/mynumber/id6747035287) All apps by Cyberdeploy Inc.: https://appshunter.io/developer/1679092362 ## Related topics [365 days calendar](https://appshunter.io/ios/topics/365-days-calendar) · [julian date calendar](https://appshunter.io/ios/topics/julian-date-calendar) · [julian date converter](https://appshunter.io/ios/topics/julian-date-converter) · [julian date](https://appshunter.io/ios/topics/julian-date) · [julian calendar](https://appshunter.io/ios/topics/julian-calendar) --- *Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-02.*