Java Date and Time

Open-source Java projects categorized as Date and Time
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Calendar Java Customizable PickerView Library
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Top 9 Java Date and Time Projects

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Date and Time

  1. Joda-Time

    Joda-Time is the widely used replacement for the Java date and time classes prior to Java SE 8.

    Project mention: Serverless applications on AWS with Lambda using Java 25, API Gateway and DynamoDB - Part 6 Using GraalVM Native Image | dev.to | 2026-04-20

    org.joda.time.DateTime, which will be used to convert a timestamp from a string and back. Such a timestamp is a part of the API Gateway proxy request and response events. In my opinion, it's time to switch from Joda-Time to the Java Date/Time API for this.

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  3. CosmoCalendar

    📅 CosmoCalendar is a fully customizable calendar with a wide variety of features and displaying modes. (by ApplikeySolutions)

  4. iCal4j

    A Java library for parsing and building iCalendar data models

  5. ThreeTenBP

    Backport of functionality based on JSR-310 to Java SE 6 and 7. This is NOT an implementation of JSR-310.

  6. Time4J

    Advanced date, time and interval library for Java with sun/moon-astronomy and calendars like Chinese, Coptic, Ethiopian, French Republican, Hebrew, Hijri, Historic Christian, Indian National, Japanese, Julian, Korean, Minguo, Persian, Thai, Vietnamese

  7. ThreeTen-Extra

    Provides additional date-time classes that complement those in JDK 8

  8. PickerView

    🕘 Android滚动选择器（省市区联动选择、日期选择、时间选择） (by duanhong169)

  9. CustomizableCalendar

    CustomizableCalendar is a library that allows you to create your calendar, customizing UI and behaviour

  10. RackMonthPicker

    android library dialog month picker

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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Java Date and Time related posts

  • Serverless applications on AWS with Lambda using Java 25, API Gateway and DynamoDB - Part 6 Using GraalVM Native Image

    2 projects | dev.to | 20 Apr 2026

  • Java language evolution (part 1)

    1 project | dev.to | 2 Oct 2025

  • Evolução da linguagem Java (parte 1)

    1 project | dev.to | 20 Sep 2025

  • History of Java: evolution, legal battles with Microsoft, Mars exploration, Spring, Gradle and Maven, IDEA and Eclipse

    1 project | dev.to | 23 Jun 2025

  • Don't use clj-time, use clojure.java-time instead

    4 projects | dev.to | 10 Jan 2024

  • How to Effectively Test Time-Dependent Code: Unit and Spring-Based Strategies

    1 project | /r/java | 10 Jul 2023

  • /u/iamthatis debunks reddit's claims regarding threats, payment, and "working with developers"

    1 project | /r/bestof | 19 Jun 2023
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    www.saashub.com | 5 Jun 2026
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Index

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

# Project Stars
1 Joda-Time 4,983
2 CosmoCalendar 1,612
3 iCal4j 834
4 ThreeTenBP 565
5 Time4J 470
6 ThreeTen-Extra 423
7 PickerView 264
8 CustomizableCalendar 220
9 RackMonthPicker 42

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