Java tutorial
//package com.java2s; /* This file is part of dgAlert Classic. dgAlert Classic is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version. dgAlert Classic is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with dgAlert Classic. If not, see <http://www.gnu.org/licenses/>. */ import java.text.SimpleDateFormat; import java.util.Date; import android.content.Context; import android.provider.Settings; public class Main { private static final String TIME_FORMAT_12_HOUR = "h:mm a"; private static final String TIME_FORMAT_24_HOUR = "H:mm"; public static String formatTimestamp(Context context, long timestamp) { String HOURS_24 = "24"; String hours; hours = Settings.System.getString(context.getContentResolver(), Settings.System.TIME_12_24); SimpleDateFormat mSDF = new SimpleDateFormat(); if (HOURS_24.equals(hours)) { mSDF.applyLocalizedPattern(TIME_FORMAT_24_HOUR); } else { mSDF.applyLocalizedPattern(TIME_FORMAT_12_HOUR); } return mSDF.format(new Date(timestamp)); } }