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.

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
Procurement managers
Logistics specialists
Investors & bankers
Time explorers
Anyone interested in time

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Time Jump does not use a network connection during normal operation - use it anywhere, anytime. It does use a network connection if access our website from within the app or provide app feedback directly to us.

What's New

Version 3.0.0

Happy New Year, Time Jumpers ( and soon to be new Time Jumpers ) !

A New Year... time to look back at what you did and make plans for the year ahead.
For many there are New Year's resolutions to be made, and hopefully kept, about new diets and exercise plans
so we can slim down for the year ahead.

Here at Time Theory Software Corporate HQ in New England we're no different... we've dusted off our vintage Nordic Track machines and pulled out our snow shoes and cross country skis ( even though it is wickedly bitter cold out ! ).

This is all well and good if you're a human, but as an app we don't think we can get much smaller or nimble so we've decided its time to

Time Jump 3.0 is now a Universal app, taking full advantage of that big beautiful screen on your iPad !

We've also done some extra dusting and cleaning so Time Jump has an extra sparkle for the new year.

As always, thank you for buying Time Jump.

Please do not hesitate to contact us with any problems or feature requests; we love to hear from you.

( Special note: if you are running iOS 11 but have not updated to iOS 11.2 or later please do so before attempting to select calendars from your device to display in Time Jump. If you don't you may experience a crash while scrolling through the list of available device calendars )

Ratings and Reviews



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.

Great calendar & duration app


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.

Great and very useful app


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.


Time Theory Software, LLC
3.6 MB
Requires iOS 9.1 or later. Compatible with iPhone, iPad, and iPod touch.
Age Rating
Rated 4+
© 2014 - 2018 Time Theory Software, LLC


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

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