EventSince is an Android app that keeps track of how long it has been since something happened: the day you quit a habit, the last time you called a friend, the start of a project, the last time you watered the plants. Each event shows a live counter, can be reset to start a new streak, and keeps a full history of every reset so you can look back at how you have been doing.

The app is written in Kotlin with Jetpack Compose and Material 3, targets Android 13 (API 33) and later, and is released under the Apache License 2.0.

Home	Event	Reset heatmap	History
Reminders	Share card	Cloud backup	Dark mode

• Events. Each event has a label, a colour, a category and a start date and time. Events can be reset (now or from a chosen moment), stopped, edited, archived and permanently deleted. An optional note can be attached to every reset.
• Live counters. Elapsed time is shown in any combination of years, months, weeks, days, hours, minutes and seconds. The unit set can be changed globally or per event.
• History and heatmap. Every operation on an event (creation, reset, stop, edit, archive, import) is logged. A calendar heatmap shows how often an event was reset and jumps to the matching log entry.
• Categories. Events are grouped into categories that can be renamed, reordered and deleted, with a choice of what happens to the events they contain.
• Goal reminders. Set a target such as "7 days" or "1 year" and get a notification when the event reaches it. Reminders use exact alarms when the user allows them (an inexact alarm otherwise) and survive reboots and time zone changes.
• Colour palettes. Fifteen colours in each of ten palettes, including one derived from the device's Material You colours. The app itself follows the system dynamic colour scheme with light and dark modes.
• Local backup. Export all data as a compressed zip archive and import it back, either replacing the current data or merging into it.
• WebDAV cloud backup. Upload backups to any WebDAV server, restore from the server, keep a limited number of remote copies, and optionally back up automatically after every change (Wi-Fi only if you prefer). The password is stored encrypted with the Android Keystore.
• Home-screen widgets. A standard widget that shows an event's counter, and a variant with a reset button.
• Share cards. Render an event as an image and share it with other apps.
• Search. Filter the home screen by label.
• Languages. English and Simplified Chinese, switchable inside the app.

EventSince is a clean-room reimplementation of TimeSince (es.desaway.timesince), an Android app that is no longer available in the app stores. It was developed from a written description of TimeSince's behaviour and data formats only, without access to its source code or assets. EventSince is not affiliated with or endorsed by the authors of TimeSince. As a courtesy to former TimeSince users, EventSince can import the .backup files that TimeSince exported, so existing events, logs and reminders can be carried over.

EventSince runs on Android 13 (API level 33) or later. Release APKs are published for arm64-v8a and x86_64 devices, together with a universal APK that contains both.

Requirements:

• JDK 17 or later (JDK 21 is used for CI)
• Android SDK with platform 37 and build-tools 36

./gradlew assembleDebug
./gradlew testDebugUnitTest

The debug build installs as a separate application (me.byang.eventsince.debug) so it can coexist with a release build.

Release builds are signed only when the keystore location and passwords are supplied as Gradle properties or environment variables (see app/build.gradle.kts); otherwise assembleRelease produces an unsigned APK, which is what CI does. The maintainer's release flow is scripts/build-release.sh, which reads the keystore password from the desktop keyring, builds one APK per ABI (arm64-v8a and x86_64) plus a universal one, verifies each signature with apksigner and writes them with versioned names, together with a SHA256SUMS file, to app/build/outputs/release-dist/.

For Google Play, scripts/build-bundle.sh builds the Android App Bundle with the same key (bundleRelease), checks the signer certificate against the keystore and writes eventsince-<version>.aab plus the R8 mapping file to the same directory. The bundle keeps both languages in the base module because the app has its own language picker. Set BUNDLETOOL to the path of a bundletool jar to also run bundletool validate.

• app/src/main/kotlin/me/byang/eventsince/core contains the pure algorithms for duration formatting, colour contrast and heatmap bucketing, which are covered by JVM unit tests.
• data, domain and di hold the Room database, DataStore preferences, repositories and Hilt wiring.
• ui contains one package per screen built with Compose and type-safe Navigation.
• backup, webdav, reminder and widget implement local and cloud backup, goal reminders and Glance widgets.

Room schema files are checked in under app/schemas so that database migrations can be verified.

EventSince keeps all data on the device and sends it only to a WebDAV server the user configures. See PRIVACY.md for the full policy in English and Chinese.

Copyright 2026 Boyuan Yang

Licensed under the Apache License, Version 2.0. See LICENSE for the full text.