# Time Jump - Date Calculator — With side-by-side calendars! > Date calculator for iOS with side-by-side calendars and business day options. (iPhone/iPad app by Time Theory Software.) - Source: https://appshunter.io/ios/app/time-jump-date-calculator/id949287666 (this page in markdown: same URL + `.md`) - Developer: [Time Theory Software](https://appshunter.io/developer/949287665) - Category: Utilities, Productivity - Price: $7.99 - Rating: 5.00/5 from 5 App Store ratings · 10 written reviews indexed - Age rating: 4+ - Requires: iOS 17.6 · 3 MB - Languages: American English - Released: 2015-04-15 - Data updated: 2026-07-21 - Monetization: paid - User reviews in markdown: https://appshunter.io/ios/app/time-jump-date-calculator/id949287666/reviews.md ## What is Time Jump? Date Calculator Time Jump for iPhone & iPad is a full-featured date calculator (counts the days between two dates) that uses side-by-side calendars to allow you to flip backward and forward in time. Tap on dates and instantly see the time difference between them in days and business days as well as the total time in years, months, weeks and days. Based on a recent customer request, results are also displayed in weeks & days. Don't want to flip through calendars? Double-tap on the selected date above either calendar and use the date picker to select a specific date – your birthday, a project deadline, an anniversary – anything. Time Jump supports dates up to 2,000 years in the past or the future. You can always tap days directly on the calendar to fine tune your selection. Time Jump's DateCalc When you need to do a specific calculation - like 180 days from a date, 45 business days before a date, 40 weeks from a date, etc. - use the DateCalc feature that allows you to add/subtract days, business days, weeks, months or years to/from any date. Business Day Calculations In addition to calendar days, Time Jump quickly and easily calculates the number of business days between two dates – this can be essential for project managers, shippers, attorneys, software developers, manufacturers – anyone working in business days. Time Jump can take US Federal and State holidays into account (skipping them) when calculating business days and you can select exactly which holidays to skip. You can also add your own custom days off (Personal Days) that are skipped for business day calculations. You can even set which days of the week are considered business days if you need to use something other than Monday through Friday. Integrated with Your iPhone/iPad Calendar Time Jump - with your permission - can be fully integrated with your iPhone/iPad calendar. You can see events - and even create or delete them - from within Time Jump. A tap on the selected date above either calendar and you will see a list of the calendar events you have chosen to view from within Time Jump in the Date Detail View. Use the Time Jump settings to select one, some or all of your calendars - including your Google calendar. Create Custom Days Off for Business Day Calculations As mentioned above, in addition to standard business day calculations, you can also add your own custom days off - Personal Days - (vacations, travel, school schedules, etc.) and Time Jump will treat these days as non-business days in the business day calculations. Of course, you can use settings to turn this feature on and off. Time Jump allows you to create your days off directly from within the app - and then they will appear in your selected iPhone calendar. Time Jump Date Detail View The Date Detail View shows you more details about a selected date: holiday information and/or a list of activities from your iPhone/iPad calendar (if you've given Time Jump permission to take a look). Once you've done a calculation you may wonder what's on your calendar and you can see your schedule from within Time Jump. Who's Time Jump for? Project managers Planners & schedulers Attorneys & paralegals Scientists Procurement managers Logistics specialists Shippers Investors & bankers Historians Educators Time explorers Anyone interested in time Follow us in Twitter: http://www.twitter.com/timetheoryapps Time Jump does not use a network connection during normal operation - use it anywhere, anytime. It does use a network connection if you access our website from within the app or provide app feedback directly to us. ## Key features - Calculate days between dates - Business day calculations - Side-by-side calendar view - Add/subtract time periods - Integrates with device calendar - Customizable holidays and days off ## Recent user reviews (10 of 10) All indexed reviews: https://appshunter.io/ios/app/time-jump-date-calculator/id949287666/reviews.md ### 5/5 — Very Convenient *2022-06-09, version 3.7.0* I tried a few date calculators before deciding on this one. Very intuitive and convenient. The layout is logical and the ability to calculate using days, business days, weeks, etc. is very handy. The developer is very responsive. Well worth the money. ### 5/5 — Wow *2021-03-11* I need to be able to calculate dates using different criteria (i.e. days, business days, business days excluding holidays). To date (pun intended) none of the other date calculators I’ve tried have come even close to the functions and simplicity of this app. This is a fantastic app that is a bargain at the price, and it really should be at the top of the app store ratings. ### 5/5 — Works great *2020-06-07, version 3.4.0* Functionality is unexpectedly useful during a pandemic to figure out how many days since I last saw my elderly mother when we are chatting on the phone. It doesn’t know how many days until we have a vaccine though. ### 5/5 — Auditor *2017-07-29* The app is a very practical tool for any personal or professional project management activity. I use it while planning and managing internal audits at a large multinational bank. I also refer to it when planning or analyzing simpler personal activities such as travel or calculating tax days in a state/country. Its clean/efficient interface and effective date calander algorithm make this app super user friendly. I'm glad I got this one. ### 5/5 — Best Date Calculator in the market - Period *2017-02-18* I have tested about 30 different time calculators on the App Store and none of them come even close. This application is fantastic in so many ways. - Fantastic intuity interface - Powerful ability to define your own working days / weekend days for counting - Ability to integrate with your calendar to create new events (such as deadlines) and mark days as 'days off' - Very friendly and pro-active developer willing to help you out with problems and take on new ideas for upgrades In a nutshell, this is the best software available for date calculations and frankly this App should be at the very top of results and not at the bottom. It took me days of flipping through tons of crappy applications to find this jewel. ### 5/5 — So Glad I Found Time Jump ! *2016-10-31* As a self confessed well designed App-A-Holic this is a fantastic app. With so many uses in business and my personal life, this app clearly identifies deadlines dates and helps in future planning. So glad I found Time Jump ! ### 5/5 — Great calendar & duration app *2016-10-22* I use Time Jump for construction planning and scheduling. It quickly and easily helps find durations between 2 dates. In my case if I know when we want a project or phase completed, I set that on the one calendar, and other calendar tells me when we need to start, based on my known duration. Best part is Time Jump lets you select national and state holidays, and then select if they are work days or not. You can also select 5-day or 6-day work weeks - very helpful. Custom days off can be added as well, but requires a little more effort - the only reason I didn't give it 5 stars. Great support from the developers as well. I definitely recommend this app. ### 5/5 — Great and very useful app *2016-10-01* Ever wonder how many business days between two dates, or wonder when 90 business days from today is? Project managers will lover this app because it quickly and easily calculates this information and more, making it a necessary tool in the PM's toolbox for sure. Personally I've used it to determine the date that is exactly 90 calendar days before my retirement date so that I could set a reminder to begin the process with HR. It works perfectly in a variety of ways. I have found it useful on many occasions. Great work. ### 5/5 — Useful and Fun! *2016-09-29* Been using Time Jump for about a year now to forecast dates based on estimates. Very useful tool. Also have fun with the app at home answering questions like how old was I when or what day was I born on. Highly recommend! ### 5/5 — Time Jump is slick! *2015-08-28* Great tool for any date calculations. Very intuitive interface and beautiful presentation of the calendars. Very useful! ## Frequently asked questions about Time Jump ### What is Time Jump used for? Time Jump is a date calculator that helps you find the number of days between two dates, calculate future or past dates by adding/subtracting time periods, and specifically count business days. It also integrates with your device's calendar. ### How does Time Jump calculate business days? Time Jump calculates business days by excluding weekends and optionally US Federal and State holidays, which can be customized. You can also add your own personal days off to be excluded from business day calculations. ### Can I see my existing calendar events in Time Jump? Yes, with your permission, Time Jump can integrate with your iPhone/iPad calendar to display events. You can choose which calendars to view and even create or delete events directly from within the app. ### What is the price of Time Jump? Time Jump is a paid application, priced at $2.99. This one-time purchase grants you full access to all its features. ### Does Time Jump have ads? No, Time Jump is ad-free. As a paid application, it does not contain any advertisements, ensuring an uninterrupted user experience. ### What devices does Time Jump support? Time Jump is available for both iPhone and iPad devices, offering a consistent experience across Apple's mobile platforms. ### How far back or forward in time can Time Jump calculate? Time Jump supports date calculations up to 2,000 years in the past or the future, providing a wide range for your planning needs. ### How often is Time Jump updated? The latest version, 3.12.0, was released on December 4, 2024. Updates are provided regularly by the developer, Time Theory Software, to enhance functionality and reliability. ## Version history (last 5 releases) ### 3.14.0 — 2026-07-09 We took advantage of the excessive heat at Time Theory World Headquarters to get some code cleaned up ( in other words, we hid out in the AC for a couple of days ). Primarily, we moved the What's New section in Settings to a more prominent place. As always, Thank You for being a Time Jump user ! ### 3.13.0 — 2026-05-30 Oh, Hi ! We stepped into the Quantum Realm and didn't realize how long we were gone ( for us it was just a couple of minutes ). We did fix a couple of small bugs while we were there... clipped text in any of the list views, tweaks to our what's new code, converted more code from Objective-C to Swift. We're back now so you can expect more regular updates. If you have a minute please leave us a review on the App Store. As always, Thank You for being a Time Jump user ! ### 3.12.0 — 2024-12-04 The holiday season is upon us once again and we love it here at Time Theory World Headquarters... decking the halls, holiday libations ( eggnog, mulled wine, tequila ( please, drink responsibly and never drink and drive )). What's new in Time Jump: With this release we've dropped support for iOS 16. The base iOS is now 17.6. This required us to rewrite the code that deals with trait collection changes ( light to dark mode specifically ) We'll have more visible UI changes in the new year. If you have any feature requests, please let us know... support@TimeTheorySoftware.com As always, Thank You for being a Time Jump user. Enjoy the holidays and those around you, stay safe, and we'll see you in the new year. ### 3.11.0 — 2024-10-18 Autumn in New England... trees changing colors, getting the final crops harvested before the first frost, getting the snow blowers out of their summer storage locations ( yuck ). The grounds here at Time Theory World Headquarters are glowing with natures fall colors, but that didn't stop us from getting our updates to Time Jump done. What's new: mostly minor internal changes. A new Settings icon ( replaced the gear icon with the 3 vertical sliders from SFSymbols ). Added more descriptive text in the Settings view so you can better understand your options. Fixed a bug in the display of a full day, month, year string that also showed the time ( found while testing on iOS 18 ) Note: We will be dropping support for iOS 16.x in the near future. If this creates an issue for you, please let us know at: Support@TimeTheorySoftware.com. As always, Thank You for being a Time Jump user ! ### 3.10.0 — 2024-04-23 Earth Day... Ahhh, the 70's, a time of great hope and optimism. Some of our team members here at Time Theory World Headquarters were in high school, some in college, none of us imagined that we'd be walking around some 40 years later with these little super computers in our pockets, let alone having the fun of writing software for them. But here we are ! What's new in this release ? The month and day names on our calendars now display in your devices preferred language. We also made some code changes to stave off future bugs ( Xcode warned us that certain things were ok for now, but wouldn't be in the future ). ( that explanation is about as cryptic as the warning message Xcode was giving us ). Please contact us with any questions, comments or feature requests. We love hearing from you. And, if you can spare the time, please leave us a review on the App Store. To quote a chalk board one of our team members recently saw in Kendal, England... "Save the Earth, it's the only planet with fried chicken" Happy Earth Day ! ## Apps similar to Time Jump | App | Rating | Price | Category | | --- | --- | --- | --- | | [Date and Time Calculator](https://appshunter.io/ios/app/date-and-time-calculator/id552798167) | 4.7 (9,100) | Free | Utilities | | [Date and Time Calculator Pro](https://appshunter.io/ios/app/date-and-time-calculator-pro/id582268389) | 4.8 (880) | $0.99 | Utilities | | [Time Calculator - Work Hours](https://appshunter.io/ios/app/time-calculator-work-hours/id565039079) | 4.7 (2,733) | Free | Utilities | | [Hours Tracker: Time Calculator](https://appshunter.io/ios/app/hours-tracker-time-calculator/id1468092377) | 4.7 (68,268) | Free | Utilities | | [Date Time Calculator - Tickr](https://appshunter.io/ios/app/date-time-calculator-tickr/id6469073541) | 5.0 (7) | Free | Utilities | | [Quickness: Add Contacts](https://appshunter.io/ios/app/quickness-add-contacts/id1449776813) | 4.7 (13) | $1.99 | Utilities | --- *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 2026-07-21.*