Converts a date from one format to another format - Android java.util

Android examples for java.util:Date Format

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Description

Converts a date from one format to another format

Demo Code


import android.util.Log;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
import java.util.Locale;
import java.util.TimeZone;

public class Main{
    private static final String TAG = TimeUtils.class.getName();
    public static final TimeZone TIME_ZONE_UTC = TimeZone
            .getTimeZone("UTC");
    /**//  w  w w .  j  av a  2  s. c  om
     * Converts a date from one format to another format
     *
     * @param originalFormat the format of the original String
     * @param originalDate the original String
     * @param newFormat the desired format of the new String
     * @return the new String
     */
    public static String convertDateTimeString(String originalFormat,
            String originalDate, String newFormat) {
        return createDateTimeString(
                parseStringToCalendar(originalDate, originalFormat),
                newFormat);
    }
    /**
     * Creates a date string according to a format string and a Calendar
     *
     * @param cal Calendar to convert to formatted string
     * @param formatString String specifying time format
     * @return a formatted date/time String
     */
    public static String createDateTimeString(Calendar cal,
            String formatString) {
        SimpleDateFormat sdf = new SimpleDateFormat(formatString, Locale.US);
        //        sdf.setTimeZone(TIME_ZONE_UTC);
        return sdf.format(calendarToDate(cal));
    }
    /**
     * Creates a date string according to a format string and a TIME_ZONE_UTC Unix milliseconds time
     *
     * @param millis UTC Unix time in milliseconds to convert to formatted string
     * @param formatString String specifying time format
     * @return a formatted date/time String
     */
    public static String createDateTimeString(long millis,
            String formatString) {
        Calendar cal = Calendar.getInstance();
        cal.setTimeInMillis(millis);
        SimpleDateFormat sdf = new SimpleDateFormat(formatString, Locale.US);
        //        sdf.setTimeZone(TIME_ZONE_UTC);
        return sdf.format(calendarToDate(cal));
    }
    /**
     * Creates a date string according to a format string and a Date
     *
     * @param date Date to convert to formatted string
     * @param formatString String specifying time format
     * @return a formatted date/time String
     */
    public static String createDateTimeString(Date date, String formatString) {
        SimpleDateFormat sdf = new SimpleDateFormat(formatString, Locale.US);
        sdf.setTimeZone(TIME_ZONE_UTC);
        return sdf.format(date);
    }
    /**
     * Parse a date/time string of the specified format into a Calendar object
     *
     * @param timeString string to be parsed
     * @param format format of string to be parsed
     * @return a Calendar based on parsed string
     */
    public static Calendar parseStringToCalendar(String timeString,
            String format) {
        return dateToCalendar(parseStringToDate(timeString, format));
    }
    /**
     * Converts a Calendar to a Date
     *
     * @param cal calendar to convert
     * @return a date
     */
    public static Date calendarToDate(Calendar cal) {
        return new Date(cal.getTimeInMillis());
    }
    /**
     * Converts a Date to a Calendar
     *
     * @param date date to convert
     * @return a calendar
     */
    public static Calendar dateToCalendar(Date date) {
        Calendar cal = Calendar.getInstance();
        cal.setTimeInMillis(date.getTime());
        cal.setTimeZone(TimeZone.getDefault());
        return cal;
    }
    /**
     * Parse a date/time string of the specified format into a Date object
     *
     * @param timeString string to be parsed
     * @param format format of string to be parsed
     * @return a Date based on parsed string
     */
    public static Date parseStringToDate(String timeString, String format) {
        SimpleDateFormat sdf = new SimpleDateFormat(format, Locale.US);
        try {
            return sdf.parse(timeString);
        } catch (ParseException e) {
            Log.e(TAG, "Could not parse date string", e);
            return null;
        }

    }
}

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