# Between Dates Calendar Math — Quick, Easy Date Calculations

> Calculate and manage date differences, add/subtract days, and save date calculations. (iPhone/iPad app by Ducky Planet LLC.)

- Source: https://appshunter.io/ios/app/between-dates-calendar-math/id442169104 (this page in markdown: same URL + `.md`)
- Developer: [Ducky Planet LLC](https://appshunter.io/developer/442169107)
- Category: Utilities, Productivity
- Price: $0.99 (on sale, was $1.99)
- Rating: 4.80/5 from 40 App Store ratings · 8 written reviews indexed
- Age rating: 4+
- Requires: iOS 13.0 · 1 MB
- Languages: American English
- Released: 2011-06-10
- Data updated: 2026-08-28
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/between-dates-calendar-math/id442169104/reviews.md

## What is Between Dates Calendar Math?

Between Days was written to quickly tell how many days are between two dates.  It uses a simple interface to get these answers in the quickest way possible.  Underneath the simplicity, Between Days is one of the most feature rich date apps in the app store.  Don’t let the simple interface fool you, this app does show a lot of information in a clean and easy to use format.

To use the app simply set the start date and end date and it will display the number of days between those two dates.  To select which date to edit you can either touch the date you want to change, or press the setting start date/ setting end date button.  The selector will automatically change to display the date selected.   It will also display the current day of the week showing on the calendar selector. 

If you would like to save the date for later, simply press the save button on the bottom.  To recall a date, or to view saved dates press the view dates button on the bottom.  Once you are at the list of dates you can sort or remove them.  You can also press on a date to use it as the current date, or press done to return to your previous dates. 

There are also add and subtract buttons.  This is useful if you need to find what the date is before or after a certain number of days, month or years. 

The copy to end date/copy to start date button will set both the start date and end date to the selected date.  

The reset button will set the beginning and end date to the current date, but will leave your saved dates alone.

I hope you enjoy this app and find it useful!  If you have any questions or comments send me an e-mail at Don.Espe@gmail.com

Please rate this app so I know if there is enough interest to develop new features for it.

## Key features

- Calculate days between dates
- Save and recall date calculations
- Sort and remove saved dates
- Add or subtract days
- Copy dates to start/end
- Reset dates to current

## Recent user reviews (8 of 8)

All indexed reviews: https://appshunter.io/ios/app/between-dates-calendar-math/id442169104/reviews.md

### 3/5 — Not the Prettiest App

*2026-04-30*

App looks clunky,, design is not great. But, it does the job.

**Developer response:** Thank you for your feedback. We appreciate your honesty and understanding. I’m always looking for ways to improve the design and features to meet the needs of the users. If you have any suggestions that would improve your experience, feel free to send them to don@duckyplanet.com.

### 5/5 — Great support from dev

*2026-04-15*

A feature was missing for my own use (mainly genealogy research) : the possibility to add/substract years also, not just days as it is now (v6.6).
I wrote to the dev about this suggestion and he replied within 24 hours that he will implement it in a future update.
Great response from Don ! 👌🏻

### 5/5 — A very necessary app

*2020-10-09*

I have depended on this app for several years. I use it to advise me of things that must been done on exact dates in the future. The developer is extremely responsive and accommodating. 
Thank you !!

**Developer response:** I'm glad I could help.

### 5/5 — Great for doctors and researchers

*2016-03-23*

Taking a medicine BID for 15 days means you should have 1 day and 7 hours left. need hours and seconds.

### 4/5 — Useful, but confusing interface

*2014-03-18*

I use this app to calculate time between my last booked flight and the next.

It works ok, although if I try to enter a date earlier than the current date, the interface can be a bit confusing with dates greyed out and so not available. Although it can be done, it would be much simpler and more intuitive if I could just choose the dates I want. 

For that reason I give it 4 stars rather than 5.

The App Support Button on the App Store page (this page) takes you to a weird site about Bath Ducks (go figure) so no apparent way to contact the developer.

### 2/5 — Interesting idea, but lacking in functionality

*2011-12-30*

Interesting idea, but lacking in functionality.
First: disable the sound. It's horrible.
Second: lack of information. For example:
- display working days vs weekends.
- maybe integrate the ability to add time gaps (for holidays ... )
- maybe some more weird info > seconds, minutes ... 
A few requests from a free user, but i think will help. 
I will change my rating accordingly for future updates ( but not only for my requests, surprise us).

### 3/5 — A little complicated

*2011-12-30*

I don't really like the layout .   Picking a date and having to copy to start or end is too much work for me. I just wanted a simple date difference.  Maybe 2 spinning wheel top n bottom n result in the middle?  And a subtract box next to result?  I think most ppl would prefer something nice simple n efficient.  I will keep this app since I need something like this, until probably the next update.

### 2/5 — Needs to have time of day also

*2011-12-30*

I will give 5 stars if u add time so that u can set even the time of the day

## Frequently asked questions about Between Dates Calendar Math

### What is Between Dates Calendar Math used for?

Between Dates Calendar Math is used to quickly calculate the number of days between two selected dates. It also allows users to save, recall, and manage these date calculations.

### Can I add or subtract days using Between Dates Calendar Math?

Yes, you can add days to the end date or subtract days from the start date to find future or past dates. This feature helps in projecting dates based on a specific duration.

### How do I save and view dates in Between Dates Calendar Math?

You can save a date calculation by pressing the save button. To view saved dates, press the 'view dates' button, where you can also sort or remove them.

### What devices is Between Dates Calendar Math compatible with?

Between Dates Calendar Math is compatible with Mac, iPhone, iPad, and iPod devices, offering a consistent experience across Apple platforms.

### How often is Between Dates Calendar Math updated?

The app was last updated on January 1, 2026, indicating a recent update. Users can expect ongoing support and potential feature additions.

### What is the age rating for Between Dates Calendar Math?

Between Dates Calendar Math has an age rating of 4+, making it suitable for a wide range of users, including children and adults.

### Does Between Dates Calendar Math have ads?

No, Between Dates Calendar Math does not contain advertisements. It provides an ad-free experience for users.

### What is the price of Between Dates Calendar Math?

Between Dates Calendar Math is available for a one-time purchase of $1.99.

## Version history (last 5 releases)

### 6.9 — 2026-04-20

Fixed some issues with the add/subtract dialogue box - including an issue with the iPad keyboard not showing up correctly.

### 6.8 — 2026-04-16

Added the ability to add or subtract months and years along with the usual days because of a user suggestion.

### 6.6 — 2026-01-01

Added a few holidays.

### 6.5 — 2025-12-16

Updated to ensure compatibility with current iOS versions.

### 6.4 — 2024-04-23

Minor interface tweaks.

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## More apps by Ducky Planet LLC

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All apps by Ducky Planet LLC: https://appshunter.io/developer/442169107

## Related topics

[between pro](https://appshunter.io/ios/topics/between-pro)

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*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 2026-08-28.*