First Commit

.gitignore

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+# Ignore
+.vscode/
+target/
+src/test/

README.md

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+<h1 align="center">DateCalculator</h1>
+<p align="center">
+	<img src="https://github.com/PieTw3lve/DateCalculator/actions/workflows/maven.yml/badge.svg" alt="Build and Publish"></a>
+	<img src="https://img.shields.io/github/v/release/PieTw3lve/DateCalculator" alt="GitHub release (latest by date)">
+	<img src="https://img.shields.io/badge/Minecraft-1.20--1.20.4-orange.svg" alt="Supported versions">
+	<a href="https://www.gnu.org/licenses/gpl-3.0"><img src="https://img.shields.io/badge/License-GPLv3-blue.svg" alt="License: GPL v3"></a>
+</p>
+
+## Information
+
+- DateCalculator is a straightforward and lightweight plugin that enables you to calculate dates.
+- This plugin is designed to be user-friendly and easy to use, with plans to develop it into a comprehensive date calculator.
+
+## Features
+
+- Calculate the amount of days between a date and the current date.
+
+## Placeholders
+
+| Placeholder                                      | Description                                                                    |
+| ------------------------------------------------ | ------------------------------------------------------------------------------ |
+| `%datecalculator_daysbetweentoday_<yyyy-MM-dd>%` | Calculates the number of days between the specified date and the current date. |
+
+## Dependencies
+
+- [PlaceholderAPI](https://www.spigotmc.org/resources/placeholderapi.6245/) (Required)
+
+## Reporting Issues
+
+- If you encounter any issues with the plugin, please report them [here](https://github.com/PieTw3lve/DateCalculator/issues).

pom.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+	<modelVersion>4.0.0</modelVersion>
+
+	<groupId>com.github.pietw3lve</groupId>
+	<artifactId>PAPI-DateCalculator</artifactId>
+	<version>1.0.0</version>
+
+	<properties>
+		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+		<maven.compiler.source>1.8</maven.compiler.source>
+		<maven.compiler.target>1.8</maven.compiler.target>
+	</properties>
+
+	<repositories>
+		<!-- This adds the Spigot Maven repository to the build -->
+		<repository>
+			<id>spigot-repo</id>
+			<url>https://hub.spigotmc.org/nexus/content/repositories/snapshots/</url>
+		</repository>
+		<!-- This adds the PlaceholderAPI Maven repository to the build -->
+		<repository>
+            <id>placeholderapi</id>
+            <url>https://repo.extendedclip.com/content/repositories/placeholderapi/</url>
+        </repository>
+	</repositories>
+
+	<dependencies>
+		<dependency>
+			<groupId>junit</groupId>
+			<artifactId>junit</artifactId>
+			<version>4.11</version>
+			<scope>test</scope>
+		</dependency>
+		<!--This adds the Spigot API artifact to the build -->
+		<dependency>
+			<groupId>org.spigotmc</groupId>
+			<artifactId>spigot-api</artifactId>
+			<version>1.15.1-R0.1-SNAPSHOT</version>
+			<scope>provided</scope>
+		</dependency>
+		<!--This adds the PlaceholderAPI artifact to the build -->
+		<dependency>
+			<groupId>me.clip</groupId>
+			<artifactId>placeholderapi</artifactId>
+			<version>2.11.5</version>
+			<scope>provided</scope>
+		</dependency>
+	</dependencies>
+
+	<build>
+		<pluginManagement>
+			<plugins>
+				<plugin>
+					<artifactId>maven-clean-plugin</artifactId>
+					<version>3.1.0</version>
+				</plugin>
+				<plugin>
+					<artifactId>maven-resources-plugin</artifactId>
+					<version>3.0.2</version>
+				</plugin>
+				<plugin>
+					<artifactId>maven-compiler-plugin</artifactId>
+					<version>3.8.0</version>
+				</plugin>
+				<plugin>
+					<artifactId>maven-surefire-plugin</artifactId>
+					<version>2.22.1</version>
+				</plugin>
+				<plugin>
+					<artifactId>maven-jar-plugin</artifactId>
+					<version>3.0.2</version>
+				</plugin>
+				<plugin>
+					<artifactId>maven-install-plugin</artifactId>
+					<version>2.5.2</version>
+				</plugin>
+				<plugin>
+					<artifactId>maven-deploy-plugin</artifactId>
+					<version>2.8.2</version>
+				</plugin>
+			</plugins>
+		</pluginManagement>
+	</build>
+</project>

src/main/java/com/github/pietw3lve/datecalculator/DateCalculatorExpansion.java

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+package com.github.pietw3lve.datecalculator;
+
+import org.bukkit.OfflinePlayer;
+
+import me.clip.placeholderapi.expansion.PlaceholderExpansion;
+
+public class DateCalculatorExpansion extends PlaceholderExpansion {
+
+    private final DateCalculatorPlugin plugin;
+
+    public DateCalculatorExpansion(DateCalculatorPlugin plugin) {
+        this.plugin = plugin;
+    }
+
+    @Override
+    public String getAuthor() {
+        return "PieTw3lve";
+    }
+
+    @Override
+    public String getIdentifier() {
+        return "datecalculator";
+    }
+
+    @Override
+    public String getVersion() {
+        return "1.0.0";
+    }
+
+    @Override
+    public boolean persist() {
+        return true;
+    }
+
+    @Override
+    public String onRequest(OfflinePlayer player, String identifier) {
+        // %datecalculator_daysbetweentoday_<yyyy-MM-dd>%
+        if (identifier.startsWith("daysbetweentoday_")) {
+            String targetDate = identifier.substring(17);
+            plugin.getLogger().info(targetDate);
+            return plugin.getDaysBetweenToday(targetDate);
+        }
+        return null;
+    }
+}

src/main/java/com/github/pietw3lve/datecalculator/DateCalculatorPlugin.java

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+package com.github.pietw3lve.datecalculator;
+
+import org.bukkit.Bukkit;
+import org.bukkit.plugin.java.JavaPlugin;
+
+import java.time.LocalDate;
+import java.time.temporal.ChronoUnit;
+
+public class DateCalculatorPlugin extends JavaPlugin
+{
+
+    public void onEnable()
+    {
+        if (Bukkit.getPluginManager().isPluginEnabled("PlaceholderAPI")) {
+            getLogger().info("PlaceholderAPI found! Registering placeholders...");
+            new DateCalculatorExpansion(this).register();
+        } else {
+            getLogger().info("Could not find PlaceholderAPI! This plugin is required.");
+            Bukkit.getPluginManager().disablePlugin(this);
+        }
+    }
+
+    public String getDaysBetweenToday(String targetDate) {
+        try {
+            LocalDate today = LocalDate.now();
+            LocalDate target = LocalDate.parse(targetDate);
+            long days = ChronoUnit.DAYS.between(target, today);
+            return String.valueOf(days);
+        } catch (Exception e) {
+            return "Invalid date format!";
+        }
+    }
+}

src/main/resources/plugin.yml

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+name: DateCalculator
+main: com.github.pietw3lve.datecalculator.DateCalculatorPlugin
+version: 1.0.0
+api-version: 1.15
+author: PieTw3lve
+website: https://github.com/PieTw3lve/DateCalculator
+description: A simple plugin to calculate the difference between two dates.
+
+# This sets PlaceholderAPI as a dependency for your plugin.
+depend: [PlaceholderAPI]