Java tutorial
//package com.java2s; import java.util.Calendar; import android.annotation.SuppressLint; import android.content.Context; import android.content.SharedPreferences; import android.preference.PreferenceManager; public class Main { @SuppressLint("DefaultLocale") public static void SaveLastWallpaperDate(Context context, Calendar dateTime) { int year = dateTime.get(Calendar.YEAR); int month = dateTime.get(Calendar.MONTH); int date = dateTime.get(Calendar.DATE); String dateTimeToString = String.format("%d/%d/%d", year, month, date); SharedPreferences preferences = PreferenceManager.getDefaultSharedPreferences(context); preferences.edit().putString("wallpaper_date", dateTimeToString).commit(); } }