Java Date to Time getTimeString(Date self)

Description

Return a string representation of the time portion of this date according to the locale-specific java.text.DateFormat#MEDIUM default format.

License

Apache License

Parameter

Parameter	Description
self	a Date

Return

a string representing the time portion of this date

Declaration

public static String getTimeString(Date self)

Method Source Code

//package com.java2s;
/*//from   w  ww  .  j  a  v  a2  s  .  c  o  m
 *  Licensed to the Apache Software Foundation (ASF) under one
 *  or more contributor license agreements.  See the NOTICE file
 *  distributed with this work for additional information
 *  regarding copyright ownership.  The ASF licenses this file
 *  to you under the Apache License, Version 2.0 (the
 *  "License"); you may not use this file except in compliance
 *  with the License.  You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing,
 *  software distributed under the License is distributed on an
 *  "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 *  KIND, either express or implied.  See the License for the
 *  specific language governing permissions and limitations
 *  under the License.
 */

import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;

import java.util.TimeZone;

public class Main {
    /**
     * <p>Return a string representation of the time portion of this date
     * according to the locale-specific {@link java.text.DateFormat#MEDIUM} default format.
     * For an "en_UK" system locale, this would be <code>HH:MM:ss</code>.
     * <p>
     * <p>Note that a new DateFormat instance is created for every
     * invocation of this method (for thread safety).
     *
     * @param self a Date
     * @return a string representing the time portion of this date
     * @see java.text.DateFormat#getTimeInstance(int)
     * @see java.text.DateFormat#MEDIUM
     * @since 1.5.7
     */
    public static String getTimeString(Date self) {
        return DateFormat.getTimeInstance(DateFormat.MEDIUM).format(self);
    }

    /**
     * <p>Create a String representation of this date according to the given
     * format pattern.
     * <p>
     * <p>For example, if the system timezone is GMT,
     * <code>new Date(0).format('MM/dd/yy')</code> would return the string
     * <code>"01/01/70"</code>. See documentation for {@link java.text.SimpleDateFormat}
     * for format pattern use.
     * <p>
     * <p>Note that a new DateFormat instance is created for every
     * invocation of this method (for thread safety).
     *
     * @param self   a Date
     * @param format the format pattern to use according to {@link java.text.SimpleDateFormat}
     * @return a string representation of this date.
     * @see java.text.SimpleDateFormat
     * @since 1.5.7
     */
    public static String format(Date self, String format) {
        return new SimpleDateFormat(format).format(self);
    }

    /**
     * <p>Create a String representation of this date according to the given
     * format pattern and timezone.
     * <p>
     * <p>For example:
     * <code>
     * def d = new Date(0)
     * def tz = TimeZone.getTimeZone('GMT')
     * println d.format('dd/MMM/yyyy', tz)
     * </code> would return the string
     * <code>"01/Jan/1970"</code>. See documentation for {@link java.text.SimpleDateFormat}
     * for format pattern use.
     * <p>
     * <p>Note that a new DateFormat instance is created for every
     * invocation of this method (for thread safety).
     *
     * @param self   a Date
     * @param format the format pattern to use according to {@link java.text.SimpleDateFormat}
     * @param tz     the TimeZone to use
     * @return a string representation of this date.
     * @see java.text.SimpleDateFormat
     * @since 1.8.3
     */
    public static String format(Date self, String format, TimeZone tz) {
        SimpleDateFormat sdf = new SimpleDateFormat(format);
        sdf.setTimeZone(tz);
        return sdf.format(self);
    }

    /**
     * <p>Shortcut for {@link java.text.SimpleDateFormat} to output a String representation
     * of this calendar instance.  This method respects the Calendar's assigned
     * {@link java.util.TimeZone}, whereas calling <code>cal.time.format('HH:mm:ss')</code>
     * would use the system timezone.
     * <p>Note that Calendar equivalents of <code>date.getDateString()</code>
     * and variants do not exist because those methods are Locale-dependent.
     * Although a Calendar may be assigned a {@link java.util.Locale}, that information is
     * lost and therefore cannot be used to control the default date/time formats
     * provided by these methods.  Instead, the system Locale would always be
     * used.  The alternative is to simply call
     * {@link java.text.DateFormat#getDateInstance(int, java.util.Locale)} and pass the same Locale
     * that was used for the Calendar.
     *
     * @param self    this calendar
     * @param pattern format pattern
     * @return String representation of this calendar with the given format.
     * @see java.text.DateFormat#setTimeZone(java.util.TimeZone)
     * @see java.text.SimpleDateFormat#format(java.util.Date)
     * @see #format(java.util.Date, String)
     * @since 1.6.0
     */
    public static String format(Calendar self, String pattern) {
        SimpleDateFormat sdf = new SimpleDateFormat(pattern);
        sdf.setTimeZone(self.getTimeZone());
        return sdf.format(self.getTime());
    }
}