dateformats.java

非常接近C/S操作方式的Java Ajax框架－ZK 用ZK框架使你的B/S应用程序更漂亮更易操作。 官网：www.zkoss.org

/* DateFormats.java

{{IS_NOTE

	Purpose: 
	Description: 
	History:
	91/01/17 15:22:22, Create, Tom M. Yeh.
}}IS_NOTE

Copyright (C) 2001 Potix Corporation. All Rights Reserved.

{{IS_RIGHT
	This program is distributed under GPL Version 2.0 in the hope that
	it will be useful, but WITHOUT ANY WARRANTY.
}}IS_RIGHT
*/
package org.zkoss.text;

import java.util.Locale;
import java.util.Date;
import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.text.ParseException;

import org.zkoss.util.Locales;

/**
 * DateFormat relevant utilities.
 *
 * @author tomyeh
 */
public class DateFormats {
	/**
	 * Parses a string to a date.
	 * It is smart enough to know whether to use DateFormat.getDateInstance
	 * and DateFormat.getDateTimeInstance.
	 * It also uses {@link Locales#getCurrent}.
	 */
	public static final Date parse(String s)
	throws ParseException {
		final Locale locale = Locales.getCurrent();
		
		if (s.indexOf(':') < 0) { //date only
			final DateFormat df =
				DateFormat.getDateInstance(DateFormat.DEFAULT, locale);
			return df.parse(s);
		} else {
			synchronized (TO_STRING_FORMAT) {
				try {
					return TO_STRING_FORMAT.parse(s);
				} catch (ParseException ex) { //ignore it
				}
			}
			final DateFormat df =
				DateFormat.getDateTimeInstance(
					DateFormat.DEFAULT, DateFormat.DEFAULT, locale);
			return df.parse(s);
		}
	}
	/** The date formatter for generating Date.toString().
	 * To use it, remember to synchronized(TO_STRING_FORMAT)
	 */
	private static final SimpleDateFormat TO_STRING_FORMAT =
		new SimpleDateFormat(
					"EEE MMM dd HH:mm:ss zzz yyyy", Locale.US);

	/** Formats a Date object based on the current Locale.
	 *
	 * @param dateOnly indicates whether to show only date; false to show
	 * both date and time
	 */
	public static final String format(Date d, boolean dateOnly) {
		Locale locale = Locales.getCurrent();

		if (dateOnly) {
			DateFormat df =
				DateFormat.getDateInstance(DateFormat.DEFAULT, locale);
			return df.format(d);
		} else {
			DateFormat df =
				DateFormat.getDateTimeInstance(
					DateFormat.DEFAULT, DateFormat.DEFAULT, locale);
			return df.format(d);
		}
	}
}