Java tutorial
/** * Copyright (c) 2000-present Liferay, Inc. All rights reserved. * * This library is free software; you can redistribute it and/or modify it under * the terms of the GNU Lesser General Public License as published by the Free * Software Foundation; either version 2.1 of the License, or (at your option) * any later version. * * This library 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 Lesser General Public License for more * details. */ package com.liferay.portal.kernel.util; import com.liferay.petra.string.StringPool; import com.liferay.portal.kernel.language.LanguageUtil; import java.text.Format; import java.util.Calendar; import java.util.Date; import java.util.Locale; import java.util.TimeZone; /** * @author Brian Wing Shun Chan */ public class Time { public static final long DAY = Time.HOUR * 24; public static final String DURATION_FORMAT = "HH:mm:ss.SSS"; public static final long HOUR = Time.MINUTE * 60; public static final long MINUTE = Time.SECOND * 60; public static final long MONTH = DAY * 30; public static final String RFC822_FORMAT = "EEE, dd MMM yyyy HH:mm:ss Z"; public static final long SECOND = 1000; public static final String SHORT_TIMESTAMP_FORMAT = "yyyyMMddkkmm"; public static final String TIMESTAMP_FORMAT = "yyyyMMddkkmmssSSS"; public static final long WEEK = DAY * 7; public static final long YEAR = DAY * 365; public static Date getDate(Calendar cal) { Calendar adjustedCal = CalendarFactoryUtil.getCalendar(); adjustedCal.set(Calendar.YEAR, cal.get(Calendar.YEAR)); adjustedCal.set(Calendar.MONTH, cal.get(Calendar.MONTH)); adjustedCal.set(Calendar.DATE, cal.get(Calendar.DATE)); adjustedCal.set(Calendar.HOUR_OF_DAY, cal.get(Calendar.HOUR_OF_DAY)); adjustedCal.set(Calendar.MINUTE, cal.get(Calendar.MINUTE)); adjustedCal.set(Calendar.SECOND, cal.get(Calendar.SECOND)); adjustedCal.set(Calendar.MILLISECOND, cal.get(Calendar.MILLISECOND)); return adjustedCal.getTime(); } public static Date getDate(Date date, TimeZone tz) { Calendar cal = CalendarFactoryUtil.getCalendar(tz); cal.setTime(date); return getDate(cal); } public static Date getDate(TimeZone tz) { Calendar cal = CalendarFactoryUtil.getCalendar(tz); return getDate(cal); } public static String getDescription(long milliseconds) { return getDescription(milliseconds, false); } public static String getDescription(long milliseconds, boolean approximate) { String s = StringPool.BLANK; int x = 0; if (approximate) { if (milliseconds <= 0) { s = "0 Second"; } else if (milliseconds < MINUTE) { x = (int) (milliseconds / SECOND); s = x + " Second"; } else if (milliseconds < HOUR) { x = (int) (milliseconds / MINUTE); s = x + " Minute"; } else if (milliseconds < DAY) { x = (int) (milliseconds / HOUR); s = x + " Hour"; } else if (milliseconds < MONTH) { x = (int) (milliseconds / DAY); s = x + " Day"; } else if (milliseconds < YEAR) { x = (int) (milliseconds / MONTH); s = x + " Month"; } else if (milliseconds >= YEAR) { x = (int) (milliseconds / YEAR); s = x + " Year"; } } else { if ((milliseconds % WEEK) == 0) { x = (int) (milliseconds / WEEK); s = x + " Week"; } else if ((milliseconds % DAY) == 0) { x = (int) (milliseconds / DAY); s = x + " Day"; } else if ((milliseconds % HOUR) == 0) { x = (int) (milliseconds / HOUR); s = x + " Hour"; } else if ((milliseconds % MINUTE) == 0) { x = (int) (milliseconds / MINUTE); s = x + " Minute"; } else if ((milliseconds % SECOND) == 0) { x = (int) (milliseconds / SECOND); s = x + " Second"; } else { x = (int) milliseconds; s = x + " Millisecond"; } } if ((x == 0) || (x > 1)) { s += "s"; } return s; } public static String getDuration(long milliseconds) { return getSimpleDate(new Date(milliseconds), DURATION_FORMAT); } public static String getRelativeTimeDescription(Date date, Locale locale, TimeZone timeZone) { return getRelativeTimeDescription(date.getTime(), locale, timeZone); } public static String getRelativeTimeDescription(Date date, Locale locale, TimeZone timeZone, Format dateTimeFormat) { return getRelativeTimeDescription(date.getTime(), locale, timeZone, dateTimeFormat); } public static String getRelativeTimeDescription(long milliseconds, Locale locale, TimeZone timeZone) { return getRelativeTimeDescription(milliseconds, locale, timeZone, null); } public static String getRelativeTimeDescription(long milliseconds, Locale locale, TimeZone timeZone, Format dateTimeFormat) { int daysBetween = DateUtil.getDaysBetween(new Date(milliseconds), new Date(), timeZone); long millisAgo = System.currentTimeMillis() - milliseconds; if (millisAgo < Time.HOUR) { long minutes = millisAgo / Time.MINUTE; if (minutes <= 1) { return LanguageUtil.get(locale, "about-a-minute-ago"); } return LanguageUtil.format(locale, "x-minutes-ago", minutes, false); } else if ((millisAgo / Time.HOUR) == 1) { return LanguageUtil.get(locale, "about-an-hour-ago"); } else if ((millisAgo < Time.DAY) || (daysBetween == 0)) { return LanguageUtil.format(locale, "x-hours-ago", millisAgo / Time.HOUR, false); } else if (daysBetween == 1) { Format timeFormat = FastDateFormatFactoryUtil.getTime(locale, timeZone); return LanguageUtil.format(locale, "yesterday-at-x", timeFormat.format(milliseconds), false); } if (dateTimeFormat == null) { dateTimeFormat = FastDateFormatFactoryUtil.getSimpleDateFormat("EEEE, MMMMM dd, yyyy", locale, timeZone); } return dateTimeFormat.format(milliseconds); } public static String getRFC822() { return getRFC822(new Date()); } public static String getRFC822(Date date) { return getSimpleDate(date, RFC822_FORMAT); } public static String getShortTimestamp() { return getShortTimestamp(new Date()); } public static String getShortTimestamp(Date date) { return getSimpleDate(date, SHORT_TIMESTAMP_FORMAT); } public static String getSimpleDate(Date date, String format) { String s = StringPool.BLANK; if (date != null) { Format dateFormat = FastDateFormatFactoryUtil.getSimpleDateFormat(format); s = dateFormat.format(date); } return s; } public static String getTimestamp() { return getTimestamp(new Date()); } public static String getTimestamp(Date date) { return getSimpleDate(date, TIMESTAMP_FORMAT); } }