# Day Genius — Name the weekday of any date

> Learn to determine the weekday of any date using a memorization method. (iPhone/iPad app by Craig Ricks.)

- Source: https://appshunter.io/ios/app/day-genius/id6801888644 (this page in markdown: same URL + `.md`)
- Developer: [Craig Ricks](https://appshunter.io/developer/6801888646)
- Category: Education, Reference
- Price: Free with in-app purchases
- Rating: 5.00/5 from 1 App Store ratings · 1 written reviews indexed
- Age rating: 4+
- Requires: iOS 26.0 · 6 MB
- Languages: American English
- Released: 2026-08-23
- Data updated: 2026-09-28
- Monetization: free with in-app purchases
- User reviews in markdown: https://appshunter.io/ios/app/day-genius/id6801888644/reviews.md

## What is Day Genius?

July 20, 1969? Sunday. July 4, 1776? Thursday. Your birthday? Work it out in your head, no calendar, no phone.

It looks like a party trick. It's a method, and Day Genius teaches it one small step at a time.

HOW IT WORKS

Every month has a code. Add it to the day of the month and a code for the year, then take out the sevens. What's left is the weekday.

1. Day numbers — 0 = Sunday through 6 = Saturday
2. Take out the sevens — turn any total into a day number
3. Month codes — twelve values, each with a memory hook
4. Combine & find the weekday — your first real answer
5. Year code — turn any year into its code
6. Leap-year rule — a small fix for January and February
7. Century shift — any century, not just your own
8. Full date — everything together, on real dates

Master a step with three drills at 90% or better and the next one opens. The first four steps are free; a one-time purchase, not a subscription, unlocks steps 5–8.

THE MONTH CODES YOU ALREADY KNOW

Learned month codes as January = 6? Keep them. The Month codes step offers the classic list (January = 0, the default) or the alternate list, every code one lower, with twelve memory hooks of its own. Year codes come matched, and every lesson, check, flashcard, drill, game, Reference table and widget follows your choice. Switch anytime.

THREE WAYS TO PRACTICE

Check yourself — untimed questions that show the reasoning, let you pick again, and record nothing.
Flashcards — a deck for every step. Tap to flip, retire what sticks, and the rest come back around. Full date adds Famous dates: twelve dates from 1776 to 2001, with what happened on the back.
Drills — timed and recorded, with no time limit: the path to mastery.

DRILLS THAT FIND YOUR WEAK SPOTS

Day Genius notices the months, years and centuries you miss or answer slowly, and mixes them back into later drills. Progress shows mastery, streak, speed trend and skill breakdown, plus a one-tap weak-spot drill and an optional daily reminder.

TWO GAMES

Speed Round — ten random dates against the clock, with a full breakdown afterward.
Date Drop — dates fall, and you drag each into its weekday bucket before it lands. Catch them early for bonus points and in a row for combos.

CORRECT BACK TO YEAR 1

Day Genius follows the calendar Britain and its colonies actually used. They skipped September 3–13, 1752, and before that every fourth year was a leap year, century years included. The Before 1752 bonus lesson shows how to work out older dates; countries that switched at other times can differ. An independent algorithm cross-checks the engine across thousands of dates.

THE REFERENCE

Every table behind the method, each opening as you master its step; tables for steps 5–8 also need the unlock. Check any date is open from the first launch: pick a date and it names the weekday. Unlock and master the Year code step, and it shows the full calculation too.

Pick the 1900s or the 2000s as your home century, and the tables, examples and drills follow it.

WIDGETS

Date of the Day hands you a fresh date to solve, Code Cards keeps a code in front of you, and Practice Streak keeps the chain going. The last two fit the Lock Screen too.

BUILT TO BE READ AND HEARD

VoiceOver support throughout, and Dynamic Type including the accessibility sizes. With VoiceOver or Reduce Motion on, Date Drop switches to a calm, button-based mode: no falling, no dragging.

FREE TO START, ONE PURCHASE FOR THE REST

The first four steps are free, decks and checks included, and they're enough to find a weekday once you're given the year code. A one-time purchase, not a subscription, unlocks steps 5–8 and their decks, Famous dates included. Both games, the Before 1752 bonus lesson and the rest of the Reference open with it as you master the steps they use.

PRIVATE BY DESIGN

No account. No ads. No personal data collected. Your progress stays on your device, and purchases are handled by Apple.

## Key features

- Step-by-step weekday calculation method
- Interactive drills and flashcards
- Two engaging practice games
- Progress tracking and weak-spot identification
- Reference tables for calculations
- Support for historical calendar rules

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Full Method | $3.99 | one-time |


## Recent user reviews (1 of 1)

All indexed reviews: https://appshunter.io/ios/app/day-genius/id6801888644/reviews.md

### 5/5 — Everyone should learn this method

*2026-09-16*

We all use calendars, we should be able to calculate dates mentally with accuracy. This app helps you master the algorithm.

## Frequently asked questions about Day Genius

### How does Day Genius teach weekday calculation?

Day Genius breaks down the process into eight manageable steps, each with memory hooks and interactive drills. You must achieve 90% accuracy in a step before unlocking the next.

### What is the cost of Day Genius?

The first four steps of Day Genius are free to use. Steps 5-8, which include year codes and century shifts, can be unlocked with a one-time purchase.

### Does Day Genius have ads?

No, Day Genius does not contain advertisements. It is a free app with an optional one-time purchase for full feature access.

### What devices does Day Genius support?

Day Genius is available on iPhone and iPad devices, making it accessible for users on the Apple ecosystem.

### How does Day Genius handle historical dates?

Day Genius correctly calculates dates according to the calendar used in Britain and its colonies, including the skipped days in 1752 and leap year rules before that era.

### Can I practice specific areas I find difficult in Day Genius?

Yes, Day Genius identifies months, years, and centuries you struggle with and incorporates them into later drills. It also offers a one-tap weak-spot drill.

### What are the games in Day Genius?

Day Genius includes two games: 'Speed Round,' where you race against the clock to identify weekdays for random dates, and 'Date Drop,' a falling-block game where you sort dates into their correct weekdays.

### How often is Day Genius updated?

The latest version of Day Genius is 1.2, which was last updated on September 15, 2026. Updates typically include improvements and new content.

## Version history (last 3 releases)

### 1.2 — 2026-09-15

Already know your month codes as January = 6? Day Genius now teaches from that list too.

In the Month codes step, choose the classic list (January = 0, still the default) or the alternate list, every code one lower. Year codes match automatically, and every lesson, check question, flashcard, drill, game, Reference table and widget follows your choice. Switch anytime; the steps you've mastered stay mastered.

ALSO NEW
• Famous dates: a Full date flashcard deck of twelve dates from 1776 to 2001, with what happened on the back
• Twelve memory hooks written for the alternate list
• Where the codes come from, now a card of its own, plus a note on why two lists exist
• A quick calendar check for any year code, and a dozens ladder for working year codes out in your head
• New check questions (if July 4 is a Saturday, what day is Halloween?) and clearer wording in all eight steps

REFINED
• Drill and Speed Round answers now fit on screen without scrolling
• Date Drop keeps every weekday bucket in view on smaller iPhones
• Tidier iPad layouts
• VoiceOver now reads the Leap year and Your own century tags on flashcards
• Many corrections and clarifications across the lessons

### 1.1 — 2026-09-01

Every step now has its own flashcard deck, not just the year codes — and the four free steps have theirs too.

Every step also has a Check yourself card: untimed questions that show the reasoning whether you are right or wrong, and record nothing. Somewhere to find out what you missed before anything counts.

Take out the sevens has been rewritten. It now starts from the week as a loop of seven days, ends every example on a day name rather than a bare number, and covers the two cases it used to skip: totals already under seven, and totals that go below zero.

Also: the month-code step explains where the twelve codes come from, the year-code step works its own anchor rule, the century step groups thirteen centuries into the four shifts you actually memorize, and Today's date now reads correctly on devices set to a non-Gregorian calendar.

### 1.0 — 2026-08-23

No release notes.

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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 2026-09-28.*