Java Calendar Format formatDate(Calendar cal)

Description

format Date

License

Apache License

Declaration

public static String formatDate(Calendar cal) 

Method Source Code

//package com.java2s;
//License from project: Apache License 

import java.text.SimpleDateFormat;

import java.util.Calendar;

import java.util.Date;

import java.util.Locale;
import java.util.TimeZone;

public class Main {
    public static final TimeZone GMT = TimeZone.getTimeZone("GMT");

    public static String formatDate(Date date) {
        Calendar cal = Calendar.getInstance();
        cal.setTime(date);//from  w w  w .j  a  v a  2  s.  c  o m
        return formatDate(cal);
    }

    /**
     *
     * @see #PATTERN_WEBDAV
     */
    public static String formatDate(Calendar cal) {
        // 2005-03-30T05:18:33Z
        StringBuilder sb = new StringBuilder();
        sb.append(cal.get(Calendar.YEAR) + "");
        sb.append('-');
        sb.append(pad2(cal.get(Calendar.MONTH) + 1));
        sb.append('-');
        sb.append(pad2(cal.get(Calendar.DAY_OF_MONTH)));
        //        sb.append('-');
        //        sb.append( pad2(cal.get(Calendar.DAY_OF_MONTH)) );
        //        sb.append('-');
        //        sb.append( pad2(cal.get(Calendar.MONTH)) );
        sb.append('T');
        sb.append(pad2(cal.get(Calendar.HOUR_OF_DAY)));
        sb.append(':');
        sb.append(pad2(cal.get(Calendar.MINUTE)));
        sb.append(':');
        sb.append(pad2(cal.get(Calendar.SECOND)));
        sb.append('Z');
        String s = sb.toString();
        //        log.debug(date.toString() + " -> " + s);
        return s;
    }

    /**
     * Formats the given date according to the specified pattern.  The pattern
     * must conform to that used by the {@link SimpleDateFormat simple date
     * format} class.
     *
     * @param date The date to format.
     * @param pattern The pattern to use for formatting the date.
     * @return A formatted date string.
     *
     * @throws IllegalArgumentException If the given date pattern is invalid.
     *
     * @see SimpleDateFormat
     */
    public static String formatDate(Date date, String pattern) {
        if (date == null)
            throw new IllegalArgumentException("date is null");
        if (pattern == null)
            throw new IllegalArgumentException("pattern is null");

        SimpleDateFormat formatter = new SimpleDateFormat(pattern, Locale.US);
        formatter.setTimeZone(GMT);
        return formatter.format(date);
    }

    public static String pad2(int i) {
        if (i < 10) {
            return "0" + i;
        } else {
            return i + "";
        }
    }
}

Related

1. formatDate(Calendar c)
2. formatDate(Calendar c)
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