# Troll Calendar

> Troll Calendar (iPhone/iPad app by Victor Engel.)

- Source: https://appshunter.io/ios/app/troll-calendar/id545125902 (this page in markdown: same URL + `.md`)
- Developer: [Victor Engel](https://appshunter.io/developer/545125905)
- Category: Reference, Entertainment
- Price: Free
- Age rating: 4+
- Requires: iOS 12.0 · 2 MB
- Languages: American English
- Released: 2012-07-29
- Data updated: 2026-05-16
- User reviews in markdown: https://appshunter.io/ios/app/troll-calendar/id545125902/reviews.md

## What is Troll Calendar?

A troll sits in a ring of seven platforms. Each platform contains a Towers of Hanoi puzzle. At midnight, the troll moves one tile in each puzzle. Five times a year, one of the puzzles is solved, revealing a stack of 9 tiles on a single tower.

The user may preview what happens at midnight by swiping left or right to move forward or backward one day or up or down to move forward or backward 73 days. Users may wish to see what happens with multiples of 73 days.

If a user double-taps, today's date is displayed.


## Version history (last 5 releases)

### 4.1.6 — 2023-06-07

Changed lunar arithmetic to use integers instead of floats.
Fixed lunar calculation error.

### 4.1.5 — 2023-06-06

Bug fixes in calculations.

### 4.1.3 — 2023-06-01

The time display at the top of the app is a time determined by the position of the sun. It ignores any daylight saving time details and is meant to represent what an observer using the sun would reckon. If the longitude is unavailable because the user did not allow location services, it is calculated from the system time and local timezone. Thus when location services are disallowed, the displayed time matches the system time. When location services are allowed, the time shown will be different from the system time by however far the user is from the actual meridian for that time offset. This could be over 2 hours different during daylight saving time, depending on the user's location in the time zone.

Previously, a location services request was made whether or not location services were available. If not available, that did nothing. Now, a check is first made to confirm that it's available before subscribing to updates.

### 4.1.2 — 2023-05-29

Fixed a bug in date calculations when all stones are on the same platform.
Increased font size for iPad.

### 4.1.0 — 2023-05-26

Corrected a bug where the moon phase description was not calculated correctly.
Added ability to navigate by date components by tapping on them at the top of the screen. If the + is showing, the component will be incremented. Tap the + icon to switch it to - which will then decrement the date according to which component is tapped.

## Apps similar to Troll Calendar

| App | Rating | Price | Category |
| --- | --- | --- | --- |
| [Shire Calendar](https://appshunter.io/ios/app/shire-calendar/id913121849) | 4.3 (18) | $0.99 | Reference |
| [HolyDates](https://appshunter.io/ios/app/holydates/id1525426911) | — | $0.99 | Reference |

## More apps by Victor Engel

- [Shadow Colors](https://appshunter.io/ios/app/shadow-colors/id1584556227)
- [WeightOnly](https://appshunter.io/ios/app/weightonly/id1635061205)

All apps by Victor Engel: https://appshunter.io/developer/545125905

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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 2026-05-16.*