The Tor Browser / file revision

 /* This Source Code Form is subject to the terms of the Mozilla Public

  * License, v. 2.0. If a copy of the MPL was not distributed with this

  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

 package org.mozilla.gecko.background.common;

 import java.util.Calendar;

 import java.util.Formatter;

 import java.util.TimeZone;

 public class DateUtils {

   private static final TimeZone UTC = TimeZone.getTimeZone("UTC");

   public static final class DateFormatter {

     private final Calendar calendar;

     private final Formatter formatter;

     private final StringBuilder builder;

     public DateFormatter() {

       this.calendar = Calendar.getInstance(UTC);

       this.builder = new StringBuilder();              // So we can reset it.

       this.formatter = new Formatter(this.builder, null);

     }

     public String getDateString(long time) {

       calendar.setTimeInMillis(time);

       builder.setLength(0);

       return formatter.format("%04d-%02d-%02d",

                               calendar.get(Calendar.YEAR),

                               calendar.get(Calendar.MONTH) + 1,      // 0-indexed.

                               calendar.get(Calendar.DAY_OF_MONTH))

                       .toString();

     }

     public String getDateStringForDay(long day) {

       return getDateString(GlobalConstants.MILLISECONDS_PER_DAY * day);

     }

   }

   public static int getDay(final long time) {

     return (int) Math.floor(time / GlobalConstants.MILLISECONDS_PER_DAY);

   }

 }