michael@0: /* This Source Code Form is subject to the terms of the Mozilla Public
michael@0:  * License, v. 2.0. If a copy of the MPL was not distributed with this
michael@0:  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
michael@0: 
michael@0: package org.mozilla.gecko.background.common;
michael@0: 
michael@0: import java.util.Calendar;
michael@0: import java.util.Formatter;
michael@0: import java.util.TimeZone;
michael@0: 
michael@0: public class DateUtils {
michael@0:   private static final TimeZone UTC = TimeZone.getTimeZone("UTC");
michael@0: 
michael@0:   public static final class DateFormatter {
michael@0:     private final Calendar calendar;
michael@0:     private final Formatter formatter;
michael@0:     private final StringBuilder builder;
michael@0: 
michael@0:     public DateFormatter() {
michael@0:       this.calendar = Calendar.getInstance(UTC);
michael@0:       this.builder = new StringBuilder();              // So we can reset it.
michael@0:       this.formatter = new Formatter(this.builder, null);
michael@0:     }
michael@0: 
michael@0:     public String getDateString(long time) {
michael@0:       calendar.setTimeInMillis(time);
michael@0:       builder.setLength(0);
michael@0:       return formatter.format("%04d-%02d-%02d",
michael@0:                               calendar.get(Calendar.YEAR),
michael@0:                               calendar.get(Calendar.MONTH) + 1,      // 0-indexed.
michael@0:                               calendar.get(Calendar.DAY_OF_MONTH))
michael@0:                       .toString();
michael@0:     }
michael@0: 
michael@0:     public String getDateStringForDay(long day) {
michael@0:       return getDateString(GlobalConstants.MILLISECONDS_PER_DAY * day);
michael@0:     }
michael@0:   }
michael@0: 
michael@0:   public static int getDay(final long time) {
michael@0:     return (int) Math.floor(time / GlobalConstants.MILLISECONDS_PER_DAY);
michael@0:   }
michael@0: }