Date and Time Calculator vs DOY
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Date and Time Calculator
Calculate the exact number of days, hours, and seconds between any two dates. This tool also allows you to find the date before or after a specified period, making it useful for tracking deadlines, events, or financial products.
- Calculate time between any two dates
- Second-level precision
- Calculate future dates
- Calculate past dates
- Period time calculation
Read full descriptionHide full description
Want to know how many days you can receive the Christmas gift? Want to know how many days you will have the college entrance exam?Want to know how many days the 158-day wealth management product expired? This tool helps you to calculate the distance between any time, down to second. It can also calculate the day after that day between any time. This tool is not only for wealth management but also for period time. It can tell you the date before or after a certain period.
DOY
This app helps you track important upcoming events by counting down the days. It also provides the Day Of Year and sunrise/sunset times for each event based on your location.
- Countdown to user-defined events
- Displays Day Of Year for events
- Provides sunrise and sunset times
- Location-based sunrise/sunset data
- Inspired by military 'short timer' tapes
Read full descriptionHide full description
They say don't count the days, make the days count. Why not do both? 40 years ago, when I was serving in the U.S. Army Field Artillery, the PX sold tapes with tear-away numbers, allowing 'short timers' to countdown the days as they neared the end of their active duty service. Those tapes are the inspiration for DOY, which tracks the number of days until a user configurable set of events. As a bonus, for each upcoming event, DOY also provides the Day Of Year, and sunrise and sunset times based on your current longitude and latitude.
Screenshots
Verdict
The clearest difference is rating: Date and Time Calculator at 4.7 against DOY's 3.0. Date and Time Calculator also leads on review sentiment (81% vs 50%) and ratings volume (9.9K vs 2). DOY's advantage is ads (none vs shown) and monetization model (free vs ad-supported). On price, in-app purchases, device support and iOS requirement there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
Date and Time Calculator holds the better App Store score, 4.7 against 3.0. That said, the two scores are not equally well evidenced: Date and Time Calculator has 9.9K ratings behind it against 2, so its average is the more settled of the two. Written reviews point the same way: 81% of Date and Time Calculator's written reviews are positive against 50% of DOY's.
Date and Time Calculator ships an update every 4 weeks, DOY every 4 months. The most recent releases landed on November 1, 2026 and October 20, 2026 respectively.
| Parameter | Date and Time Calculator | DOY |
|---|---|---|
| Price | Free | Free |
| Rating | 4.7 (9.9K ratings) — better | 3.0 (2 ratings) |
| Positive reviews | 81.0% of reviews — better | 50.0% of reviews |
| Number of ratings | 9.9K — better | 2 |
| Update frequency | Every 4 weeks — better | Every 4 months |
| Ads | Yes | No — better |
| In-app purchases | No | No |
| Monetization | Ad-supported | Free — better |
| Devices | iPhone, iPod | iPhone, iPod |
| Requires iOS | 15.0 | 15.0 |
| Further details — not scored | ||
| Size | 18 MB | 6 MB |
| Age rating | 4+ | 4+ |
| Developer | 山 钟 | Daniel Hansen |
Customer experience
Date and Time Calculator
DOY
Bugs and requests
Date and Time Calculator
Reported bugs
3 issues- Date/time calculations not always accurate
- Inability to close ads
- Compatibility issues on certain devices
Requested features
4 requests- Option to calculate business days
- Ability to save frequently used dates
- 24-hour time format
- Improved user interface
DOY
Not enough reviews yet to summarise bugs or requests.
In-app purchases
Date and Time Calculator
No in-app purchases
DOY
No in-app purchases
Questions
Is Date and Time Calculator free?
Is DOY free?
Which has better reviews, Date and Time Calculator or DOY?
Do Date and Time Calculator or DOY have ads?
Which is updated more often, Date and Time Calculator or DOY?
Other comparisons
