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Azolla.org Core Library for Java
There is a newer version: 2.0.3
/*
 * @(#)Date0.java		Created at 2013-6-30
 * 
 * Copyright (c) 2011-2013 azolla.org All rights reserved.
 * Azolla PROPRIETARY/CONFIDENTIAL. Use is subject to license terms. 
 */
package org.azolla.l.ling.util;

import org.azolla.l.ling.exception.code.AzollaCode;
import org.azolla.l.ling.text.Fmt0;

import javax.annotation.Nonnull;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;

/**
 * DateHelper
 *
 * @author [email protected]
 * @since ADK1.0
 */
public final class Date0
{
    public static final String Y              = "yyyy";
    public static final String M              = "MM";
    public static final String D              = "dd";
    public static final String YM             = "yyyyMM";
    public static final String YMD            = "yyyyMMdd";
    public static final String YM_WITH_DASH   = "yyyy-MM";
    public static final String DATE_WITH_DASH = "yyyy-MM-dd";

    public static final String H               = "HH";
    public static final String MI              = "mm";
    public static final String S               = "ss";
    public static final String TIME_WITH_COLON = "HH:mm:ss";

    public static final String DATETIME_WITH_UNDERLINE       = "yyyy_MM_dd_HH_mm_ss";
    public static final String DATETIME_WITH_DASH_AND_COLON  = "yyyy-MM-dd HH:mm:ss";               //2013-05-04 19:51:08
    public static final String DATETIME                      = "yyyyMMddHHmmss";
    public static final String DATETIME_WITH_SLASH_AND_COLON = "yyyy/MM/dd HH:mm:ss";

    /**
     * 20130701195108
     *
     * @return String
     */
    public static final String DATATIME()
    {
        return toString(now(), DATETIME);
    }

    /**
     * 201307
     *
     * @return String
     */
    public static final String YM()
    {
        return toString(now(), YM);
    }

    public static Date now()
    {
        return new Date();
    }

    public static String toString(Date date)
    {
        return toString(date, DATETIME_WITH_DASH_AND_COLON);
    }

    public static String toString(String pattern)
    {
        return toString(now(), pattern);
    }

    public static String toString(Date date, String pattern)
    {
        return new SimpleDateFormat(pattern).format(date);
    }

    public static long toUnixTimestamp()
    {
        return toUnixTimestamp(now());
    }

    public static long toUnixTimestamp(Date date)
    {
        return date.getTime();
    }

    public static Date valueOf(long timestamp)
    {
        return new Date(timestamp);
    }

    public static Date valueOf(String date)
    {
        return valueOf(date, DATETIME_WITH_DASH_AND_COLON);
    }

    public static Date valueOf(String date, String pattern)
    {
        Date rtnDate = null;

        try
        {
            rtnDate = new SimpleDateFormat(pattern).parse(date);
        }
        catch (ParseException e)
        {
            Log0.error(Date0.class, Fmt0.LOG_EC_P_M, AzollaCode.PARSEEXCEPTION, KV.ins("date", date).put("pattern", pattern), e);
            rtnDate = null;
        }

        return rtnDate;
    }

    public static int compareWithNow(@Nonnull Date date)
    {
        return date.compareTo(now());
    }

}