Java Parse Date parseDate(String dateString)

Description

parse Date

License

Open Source License

Declaration

public static Date parseDate(String dateString) throws ParseException 

Method Source Code

//package com.java2s;
import java.text.DateFormat;

import java.text.ParseException;

import java.util.ArrayList;

import java.util.Date;
import java.util.List;
import java.util.Locale;

import java.util.TimeZone;

public class Main {
    public static Date parseDate(String dateString) throws ParseException {
        return parseDate(dateString, Locale.getDefault(), TimeZone.getDefault());
    }/*from  w  w w . j  av a 2  s .  co  m*/

    @SuppressWarnings("deprecation")
    public static Date parseDate(String dateString, Locale locale, TimeZone timezone) throws ParseException {
        Date date = null;
        dateString = dateString.replaceAll("(p|P)\\.(m|M)\\.", "PM").replaceAll("(a|A)\\.(m|M)\\.", "AM");
        try {
            // Use the deprecated Date.parse method as this is very good at detecting
            // dates commonly output by the US and UK standard locales of dotnet that
            // are output by the Microsoft command line client.
            date = new Date(Date.parse(dateString));
        } catch (IllegalArgumentException e) {
            // ignore - parse failed.
        }
        if (date == null) {
            // The old fashioned way did not work. Let's try it using a more
            // complex alternative.
            DateFormat[] formats = createDateFormatsForLocaleAndTimeZone(locale, timezone);
            return parseWithFormats(dateString, formats);
        }
        return date;
    }

    /**
     * Build an array of DateFormats that are commonly used for this locale
     * and timezone.
     */
    static DateFormat[] createDateFormatsForLocaleAndTimeZone(Locale locale, TimeZone timeZone) {
        List<DateFormat> formats = new ArrayList<DateFormat>();

        addDateTimeFormatsToList(locale, timeZone, formats);
        addDateFormatsToList(locale, timeZone, formats);

        return formats.toArray(new DateFormat[formats.size()]);
    }

    static Date parseWithFormats(String input, DateFormat[] formats) throws ParseException {
        ParseException parseException = null;
        for (int i = 0; i < formats.length; i++) {
            try {
                return formats[i].parse(input);
            } catch (ParseException ex) {
                parseException = ex;
            }
        }
        if (parseException == null) {
            throw new IllegalStateException("No dateformats found that can be used for parsing '" + input + "'");
        }
        throw parseException;
    }

    static void addDateTimeFormatsToList(Locale locale, TimeZone timeZone, List<DateFormat> formats) {
        for (int dateStyle = DateFormat.FULL; dateStyle <= DateFormat.SHORT; dateStyle++) {
            for (int timeStyle = DateFormat.FULL; timeStyle <= DateFormat.SHORT; timeStyle++) {
                DateFormat df = DateFormat.getDateTimeInstance(dateStyle, timeStyle, locale);
                if (timeZone != null) {
                    df.setTimeZone(timeZone);
                }
                formats.add(df);
            }
        }
    }

    static void addDateFormatsToList(Locale locale, TimeZone timeZone, List<DateFormat> formats) {
        for (int dateStyle = DateFormat.FULL; dateStyle <= DateFormat.SHORT; dateStyle++) {
            DateFormat df = DateFormat.getDateInstance(dateStyle, locale);
            df.setTimeZone(timeZone);
            formats.add(df);
        }
    }
}

Related

1. parseDate(String dateStr, String dateFormat)
2. parseDate(String dateStr, String dateFormat)
3. parseDate(String dateStr, String format)
4. parseDate(String dateStr, String format)
5. parseDate(String dateStr, String... formats)
6. parseDate(String dateString)
7. parseDate(String dateString)
8. parseDate(String dateString)
9. parseDate(String dateString)