Time Jump - Date Calculator 4+

With side-by-side calendars‪!‬

Time Theory Software

Designed for iPad

    • 5.0 • 5 Ratings
    • $2.99



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
Procurement managers
Logistics specialists
Investors & bankers
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.

What’s New

Version 3.10.0

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 !

Ratings and Reviews

5.0 out of 5
5 Ratings

5 Ratings

Capvo ,


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.

Dvlrbbt ,


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.

Dmackster ,

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.

App Privacy

The developer, Time Theory Software, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy.

Data Not Collected

The developer does not collect any data from this app.

Privacy practices may vary, for example, based on the features you use or your age. Learn More


  • Family Sharing

    Up to six family members can use this app with Family Sharing enabled.

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