Guess the day of week of a random date
About this app
A trainer for calculating the day of the week of any given date.
This app displays a random date and asks you what day of the week that date is. Then it checks your answer. Optionally it measures how long it took you. In the settings you can configure the range for the random date.
If you want to learn how to do this calculation, check out on the developer's website!
Licensed under GPL-3.0-only, by Moritz Firsching.
What's New in v1.04
Imported from the F-Droid repository index.
Version history
Jun 17, 2018 · 1.7 MB · Android API 15–27 · code 8
Imported from the F-Droid repository index.
SHA-256 f9413783bdf8c11259e2f7544ad05a6c345cb4fc10c9d8c0ac08334fb67cad02
Jun 17, 2018 · 1.7 MB · Android API 15–27 · code 7
Imported from the F-Droid repository index.
SHA-256 38190711ca02e7641c686faa5ca76ec4d53db9f2b823f5e02448b574323a51c2
Dec 11, 2017 · 1.4 MB · Android API 15–23 · code 6
Imported from the F-Droid repository index.
SHA-256 4934eef93af6baee98e4ec191d33cc6cce0b99747a33fc1f9cc4306f96172522
Will it run on your device?
73%
- Runs on a broad range of modern Android versions.
- ABI coverage is focused on newer 64-bit devices.
Installation Guide
Open Settings on your Android device
Go to Security → Unknown sources (or Install unknown apps)
Enable "Allow from this source" for your browser or file manager
Open the downloaded APK file from your Downloads folder
Tap "Install" and wait for installation to complete
Launch the app from your home screen
Make sure to re-enable Unknown Sources restrictions after installation for security.
How to install this safely
How to verify the file you downloaded
Before you install anything, confirm the file is the one described here. On a computer, run shasum -a 256 your-download.apk (macOS or Linux) or certutil -hashfile your-download.apk SHA256 (Windows), then compare the output character-for-character with the SHA-256 on this page. If a single character differs, the file is not the build we recorded — delete it.
What the signing certificate proves
Every Android app is signed with a private key that only its developer holds. The fingerprint on this page is a hash of the matching public certificate, and it proves continuity rather than identity: it tells you a build came from whoever signed the earlier ones. Android enforces this at install time — if a package claiming to be com.goltzkiste.guessaday is signed with a different key, the system will refuse to install it over your existing copy. A fingerprint that changes between releases is worth pausing on, because a repackaged app that has been modified by someone else cannot keep the original signature.
How to roll back to an earlier version
If the current release misbehaves, 1.03 is the last build before it. Android will not install an older version code over a newer one, so you must uninstall Guessaday first — which clears its local data unless you have a backup. Reinstall the older APK only if its signing fingerprint matches the build you already trust, and check the API range: an older release may target an Android version your device has moved past.
Why we list sources instead of hosting everything
The official store channel is almost always the right choice: it updates automatically and carries the publisher's own distribution guarantees. A direct APK is useful when a device has no store access, when a rollout has not reached your region, or when you need a specific version — and only when the publisher has authorized that copy. APKBrowse does not list pirated, cracked, or unauthorized rebuilds of Guessaday, and a listing is removed when the evidence for it stops holding up.
Get Guessaday
Every source we list for com.goltzkiste.guessaday is legality-reviewed. Pirated or cracked builds are never offered.
Other sources
F-Droid listing
officialF-Droid builds this app from source and signs it. This is its official listing, with older builds and full release notes.
Source code
verified publisherThe upstream repository this build is compiled from.
We check legality and signature continuity, but device behaviour still varies. Install at your own discretion.
App Information
Security Verification
We record provenance; we do not run malware scans. Verify the hash yourself before installing.
SHA-256 Hash
f9413783bdf8c11259e2f7544ad05a6c345cb4fc10c9d8c0ac08334fb67cad02
Signing certificate
0a94d10451ca44644fd9caecb041fe8748f30c50f474d2ea66cae641698b8537
Previous Versions
The signing certificate fingerprint for this release is on record, so a build that does not match it did not come from this publisher.
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