Java tutorial
/* * DateTimeUtil.java * * Copyright (C) 2005-2009 Tommi Laukkanen * http://www.substanceofcode.com * * This program 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 2 of the License, or * (at your option) any later version. * * This program 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 this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA * */ //package com.substanceofcode.utils; import java.util.Calendar; import java.util.Date; import java.util.TimeZone; /** * <p>This class provides methods for dealing with Dates and Times.</p> * * In particular it deals with converting Dates/Times to String representations of those values. * * @author Tommi Laukkanen * @author Barry Redmond */ public abstract class DateTimeUtil { /** Get current Date stamp * @return The Curretn Date/Time in the format: yyyymmdd_hhmm */ public static String getCurrentDateStamp() { return convertToDateStamp(System.currentTimeMillis()); } /** Convert given date to string<br> * OutputFormat: yyyymmdd_hhmm * @return The Date/Time in the format: yyyymmdd_hhmm */ public static String convertToDateStamp(long time) { Calendar cal = Calendar.getInstance(); cal.setTime(new Date(time)); return convertToDateStamp(cal); } /** Convert given date to string<br> * OutputFormat: yyyymmdd_hhmm * @return The Date/Time in the format: yyyymmdd_hhmm */ public static String convertToDateStamp(Date date) { Calendar cal = Calendar.getInstance(); cal.setTime(date); return convertToDateStamp(cal); } /** Convert given date to string<br> * OutputFormat: yyyymmdd_hhmm * @return The Date/Time in the format: yyyymmdd_hhmm */ public static String convertToDateStamp(Calendar cal) { String year = String.valueOf(cal.get(Calendar.YEAR)); String month = String.valueOf(cal.get(Calendar.MONTH) + 1); if (month.length() == 1) { month = "0" + month; } String day = String.valueOf(cal.get(Calendar.DAY_OF_MONTH)); if (day.length() == 1) { day = "0" + day; } String hour = String.valueOf(cal.get(Calendar.HOUR_OF_DAY)); if (hour.length() == 1) { hour = "0" + hour; } String minute = String.valueOf(cal.get(Calendar.MINUTE)); if (minute.length() == 1) { minute = "0" + minute; } String second = String.valueOf(cal.get(Calendar.SECOND)); if (second.length() == 1) { second = "0" + second; } String dateStamp = year + month + day + "_" + hour + minute + second; return dateStamp; } /** * Get current time stamp in universal format<br> * Format: yyyy-mm-ddThh:mm:ssZ<br> * e.g.: 1999-09-09T13:10:40Z * @return The Date in the format: yyyy-mm-ddThh:mm:ssZ */ public static String getUniversalDateStamp(long time) { Calendar cal = Calendar.getInstance(); cal.setTime(new Date(time)); return getUniversalDateStamp(cal); } /** * Get date from given date stamp. * Format: yyyy-mm-ddThh:mm:ssZ * @param stamp * @return */ public static Date getDateFromUniversalDateStamp(String stamp) { // Log.debug("Parsing date: " + stamp); String year = stamp.substring(0, 4); String month = stamp.substring(5, 7); String day = stamp.substring(8, 10); String hour = stamp.substring(11, 13); String minutes = stamp.substring(14, 16); String seconds = stamp.substring(17, 19); //Log.debug(year+"-"+month+"-"+day+"T"+hour+":"+minutes+":"+seconds); Calendar cal = Calendar.getInstance(); cal.setTimeZone(TimeZone.getTimeZone("UNC+0")); cal.set(Calendar.YEAR, Integer.parseInt(year)); cal.set(Calendar.MONTH, Integer.parseInt(month) - 1); cal.set(Calendar.DAY_OF_MONTH, Integer.parseInt(day)); cal.set(Calendar.HOUR_OF_DAY, Integer.parseInt(hour)); cal.set(Calendar.MINUTE, Integer.parseInt(minutes)); cal.set(Calendar.SECOND, Integer.parseInt(seconds)); Date date = cal.getTime(); return date; } /** * Get current time stamp in universal format<br> * Format: yyyy-mm-ddThh:mm:ssZ<br> * e.g.: 1999-09-09T13:10:40Z * @return The Date in the format: yyyy-mm-ddThh:mm:ssZ */ public static String getUniversalDateStamp(Date date) { Calendar cal = Calendar.getInstance(); cal.setTime(date); return getUniversalDateStamp(cal); } /** * Get current time stamp in universal format<br> * Format: yyyy-mm-ddThh:mm:ssZ<br> * e.g.: 1999-09-09T13:10:40Z * @return The Date in the format: yyyy-mm-ddThh:mm:ssZ */ public static String getUniversalDateStamp(Calendar cal) { String year = String.valueOf(cal.get(Calendar.YEAR)); String month = String.valueOf(cal.get(Calendar.MONTH) + 1); if (month.length() == 1) { month = "0" + month; } String day = String.valueOf(cal.get(Calendar.DAY_OF_MONTH)); if (day.length() == 1) { day = "0" + day; } String hour = String.valueOf(cal.get(Calendar.HOUR_OF_DAY)); if (hour.length() == 1) { hour = "0" + hour; } String minute = String.valueOf(cal.get(Calendar.MINUTE)); if (minute.length() == 1) { minute = "0" + minute; } String second = String.valueOf(cal.get(Calendar.SECOND)); if (second.length() == 1) { second = "0" + second; } String dateStamp = year + "-" + month + "-" + day + "T" + hour + ":" + minute + ":" + second + "Z"; return dateStamp; } /** Convert date to short time string * @return The Date in the format: hh:mm:ss */ public static String convertToTimeStamp(long time) { return convertToTimeStamp(time, true); } /** Convert date to short time string * @return The Date in the format: hh:mm:ss */ public static String convertToTimeStamp(Date date) { return convertToTimeStamp(date, true); } /** Convert date to short time string * @return The Date in the format: hh:mm:ss */ public static String convertToTimeStpam(Calendar cal) { return convertToTimeStamp(cal, true); } /** Convert date to short time string * @param showSeconds Wheather or not to show just the hours and minutes part, or to show the seconds part also. * @return The Date in the format: hh:mm:ss */ public static String convertToTimeStamp(long time, boolean showSeconds) { return convertToTimeStamp(new Date(time), showSeconds); } /** Convert date to short time string * @param showSeconds Wheather or not to show just the hours and minutes part, or to show the seconds part also. * @return The Date in the format: hh:mm:ss */ public static String convertToTimeStamp(Date date, boolean showSeconds) { Calendar c = Calendar.getInstance(); c.setTime(date); return convertToTimeStamp(c, showSeconds); } /** * * @param time * @param showSeconds Wheather or not to show just the hours and minutes part, or to show the seconds part also. * @return The Date in the format: hh:mm:ss */ public static String convertToTimeStamp(Calendar time, boolean showSeconds) { String hours = Integer.toString(time.get(Calendar.HOUR_OF_DAY)); if (hours.length() == 1) { hours = '0' + hours; } String minutes = Integer.toString(time.get(Calendar.MINUTE)); if (minutes.length() == 1) { minutes = '0' + minutes; } if (showSeconds) { String seconds = Integer.toString(time.get(Calendar.SECOND)); if (seconds.length() == 1) { seconds = '0' + seconds; } return hours + ":" + minutes + ":" + seconds; } else { return hours + ":" + minutes; } } /** * * @param startDate Interval start date time * @param endDate Interval end date time * @return Time interval in format hh:mm:ss */ public static String getTimeInterval(Date startDate, Date endDate) { long interval = (endDate.getTime() - startDate.getTime()); if (interval == 0) { return "00:00:00"; } long intervalSeconds = interval / 1000; long hours = intervalSeconds / 3600; long minutes = (intervalSeconds % 3600) / 60; long seconds = intervalSeconds % 60; String hoursText = String.valueOf(hours); if (hoursText.length() == 1) { hoursText = "0" + hoursText; } String minutesText = String.valueOf(minutes); if (minutesText.length() == 1) { minutesText = "0" + minutesText; } String secondsText = String.valueOf(seconds); if (secondsText.length() == 1) { secondsText = "0" + secondsText; } return hoursText + ":" + minutesText + ":" + secondsText; } }