Java Time

Open-source Java projects categorized as Time
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Java Android Library Date Chat & Messaging
InfluxDB – Built for High-Performance Time Series Workloads
InfluxDB 3 OSS is now GA. Transform, enrich, and act on time series data directly in the database. Automate critical tasks and eliminate the need to move data externally. Download now.
www.influxdata.com
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Top 7 Java Time Projects

Time

  1. HijriDatePicker

    Material (Gregorian - Hijri) Date & Time Picker

  2. Sevalla

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  3. Language_Time

    A library that converts Time to its equivalent local languages starting with some basic Nigeria languages(Yoruba, Hausa, Igbo, Efik and English)

  4. cas

    Cellular Automata Simulator (by ghjansen)

  5. itu

    An extremely fast parser and formatter of standardized date and date-times supporting RFC-3339 (ISO-8601 profile) and more.

  6. hourglass

    Hourglass is a Minecraft Forge mod that gives you control over the passage of time. It allows you to customize the length of the day-night cycle and alters the Minecraft sleep mechanic by accelerating the speed of time. (by DuckyCrayfish)

  7. jolikit

    Java APIs to abstract away time (clocks, schedulers), simple 2D UIs (BWD), and a bit more, with default implementations

    Project mention: Don't Look Down on Print Debugging | news.ycombinator.com | 2024-11-23

    >I appended (...) traces into (...) memory. (...) An unrelated process would read (...) at opportune time and hand over to the developer.

    I did something similar to debug concurrent treatments in Java, that allows to accumulate log statements in thread-local or instance-local collections and then publish them with possibly just a lazySet():

    https://github.com/jeffhain/jolikit/blob/master/src/main/jav...

  8. timestone

    a Java library for abstracting time sources, enabling deterministic and testable time-dependent logic

    Project mention: Timestone: A Lightweight Java Library for Testing Time-Based Logic | dev.to | 2025-07-24

    I’m excited to share an open-source project I’ve been working on called Timestone, a small but handy Java library for abstracting time sources and writing deterministic, testable time-based logic.

  9. InfluxDB

    InfluxDB – Built for High-Performance Time Series Workloads. InfluxDB 3 OSS is now GA. Transform, enrich, and act on time series data directly in the database. Automate critical tasks and eliminate the need to move data externally. Download now.

    InfluxDB logo
NOTE: The open source projects on this list are ordered by number of github stars. The number of mentions indicates repo mentiontions in the last 12 Months or since we started tracking (Dec 2020).

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Index

What are some of the best open-source Time projects in Java? This list will help you:

# Project Stars
1 HijriDatePicker 147
2 Language_Time 52
3 cas 36
4 itu 35
5 hourglass 14
6 jolikit 6
7 timestone 1

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