app.sunstreak.yourpisd.util.DateHelper.java Source code

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Here is the source code for app.sunstreak.yourpisd.util.DateHelper.java

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/**
 * This file is part of yourPISD.
 *
 *  yourPISD is free software: you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation, either version 3 of the License, or
 *  (at your option) any later version.
 *
 *  yourPISD is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with yourPISD.  If not, see <http://www.gnu.org/licenses/>.
 */

package app.sunstreak.yourpisd.util;

import org.joda.time.DateTime;
import org.joda.time.Instant;
import org.joda.time.Interval;
import org.joda.time.LocalDate;
import org.joda.time.MonthDay;
import org.joda.time.Period;
import org.joda.time.format.DateTimeFormat;
import org.joda.time.format.DateTimeFormatter;
import org.joda.time.format.PeriodFormatter;
import org.joda.time.format.PeriodFormatterBuilder;

public class DateHelper {

    public static DateTimeFormatter dtf;
    public static PeriodFormatter pf;
    public static DateTimeFormatter humanFormat;
    public static DateTimeFormatter webFormat;
    public static DateTimeFormatter webFormatWithSpaces;
    public static DateTime startOfSchoolYear;

    static {
        dtf = DateTimeFormat.forPattern("MMM dd");
        humanFormat = DateTimeFormat.forPattern("E MMM d");
        webFormat = DateTimeFormat.forPattern("yyyy-M-dd");
        webFormatWithSpaces = DateTimeFormat.forPattern("MMM dd yyyy");
        pf = new PeriodFormatterBuilder().printZeroNever().appendMonths().appendSuffix(" month", " months")
                .appendSeparator(", ").printZeroNever().appendWeeks().appendSuffix(" week", " weeks")
                .appendSeparator(", ").appendDays().appendSuffix(" day", " days").toFormatter();
        startOfSchoolYear = webFormatWithSpaces.parseDateTime("Aug 26 2013");
    }

    public static String timeSince(long millis) {
        return timeSince(new DateTime(millis));
    }

    public static String timeSince(DateTime dt) {

        StringBuilder sb = new StringBuilder();
        sb.append("Last updated ");

        Period pd = new Interval(dt.getMillis(), Instant.now().getMillis()).toPeriod();
        if (pd.getDays() > 0) {
            sb.append(pd.getDays());
            return sb.append(" days ago").toString();
        }
        if (pd.getHours() > 0)
            sb.append(pd.getHours() + "hours ");
        if (pd.getMinutes() > 0) {
            sb.append(pd.getMinutes() + " minutes");
            return sb.append(" ago").toString();
        }
        return sb.append("less than a minute ago").toString();

    }

    /**
     * 
     * @param date formatted as "MMM dd" (Short month + day)
     * @return
     */
    public static String daysRelative(String date) {
        DateTime dt = dtf.parseDateTime(date);
        return daysRelative(dt);
    }

    public static String daysRelative(DateTime dt) {
        while (dt.isBefore(startOfSchoolYear))
            dt = dt.plusYears(1);

        // if today
        if (dt.toLocalDate().isEqual(new LocalDate()))
            return "(today)";

        Period pd;
        if (dt.isBeforeNow())
            pd = new Interval(dt, new LocalDate().toDateTimeAtStartOfDay()).toPeriod();
        else
            pd = new Interval(new LocalDate().toDateTimeAtStartOfDay(), dt).toPeriod();
        StringBuilder sb = new StringBuilder("\n(");

        int compare = dt.compareTo(new DateTime());

        sb.append(pf.print(pd));
        // Compare to now.
        if (dt.isBeforeNow())
            sb.append(" ago)");
        else
            sb.append(" from now)");
        return sb.toString();
    }

    public static String toHumanDate(String webDate) {
        return webFormat.parseDateTime(webDate).toString(humanFormat);
    }

    public static boolean isAprilFools() {
        MonthDay now = MonthDay.now();
        return (now.getDayOfMonth() == 1 || now.getDayOfMonth() == 2) && now.getMonthOfYear() == 4;

    }

}