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Cristal-ise is a description-driven software platform originally developed to track the construction of the CMS ECAL detector of the LHC at CERN. This is its core library, known as the kernel, which manages business objects called Items. Items are entirely configured from data, called descriptions, held in other Items. Every change of a state in an Item is a consequence of an execution of an activity in that Item's lifecycle, meaning that Cristal-ise applications are completely traceable, even in their design. It also supports extensive versioning of Item description data, giving the system a high level of flexibility.
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/**
 * This file is part of the CRISTAL-iSE kernel.
 * Copyright (c) 2001-2015 The CRISTAL Consortium. All rights reserved.
 *
 * This library is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as published
 * by the Free Software Foundation; either version 3 of the License, or (at
 * your option) any later version.
 *
 * This library is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; with out even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
 * License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this library; if not, write to the Free Software Foundation,
 * Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
 *
 * http://www.fsf.org/licensing/licenses/lgpl.html
 */
package org.cristalise.kernel.utils;

import java.sql.Timestamp;
import java.time.OffsetDateTime;
import java.time.ZoneId;
import java.time.ZoneOffset;
import java.time.ZonedDateTime;
import java.time.format.DateTimeFormatter;
//import java.util.Calendar;
import java.util.Date;

import org.cristalise.kernel.common.GTimeStamp;
import org.cristalise.kernel.common.InvalidDataException;

public class DateUtility {

    public static GTimeStamp setToNow(GTimeStamp date) {
        GTimeStamp now = getNow();

        date.mYear       = now.mYear;
        date.mMonth      = now.mMonth;
        date.mDay        = now.mDay;
        date.mHour       = now.mHour;
        date.mMinute     = now.mMinute;
        date.mSecond     = now.mSecond;
        date.mTimeOffset = now.mTimeOffset;

        return date;
    }

    static public GTimeStamp getNow() {
        ZonedDateTime now = ZonedDateTime.now();

        return new GTimeStamp( now.getYear(),
                               now.getMonth().getValue(),
                               now.getDayOfMonth(),
                               now.getHour(),
                               now.getMinute(),
                               now.getSecond(),
                               //store millisecond for backward compability (originally java Calendar was used)
                               now.getOffset().getTotalSeconds()*1000 ); 
    }

    public static String getSQLFormat(GTimeStamp timeStamp) {
        StringBuffer time = new StringBuffer().append(timeStamp.mYear).append("-");
        if (timeStamp.mMonth < 10) time.append("0");
        time.append(timeStamp.mMonth).append("-");

        if (timeStamp.mDay < 10) time.append("0");
        time.append(timeStamp.mDay).append(" ");

        if (timeStamp.mHour < 10) time.append("0");
        time.append(timeStamp.mHour).append(":");

        if (timeStamp.mMinute < 10) time.append("0");
        time.append(timeStamp.mMinute).append(":");

        if (timeStamp.mSecond < 10) time.append("0");
        time.append(timeStamp.mSecond);

        return time.toString();
    }

    public static int getNbDayInYear(GTimeStamp date) {
        int centuary = date.mYear / 100;
        int cdivby4 = centuary / 4;
        int ydivby4 = date.mYear / 4;
        if (centuary * 100 - date.mYear == 0) {
            if (centuary == cdivby4 * 4) return 366;
            else return 365;
        }
        else if (date.mYear == ydivby4 * 4) return 366;
        else return 365;
    }

    public static int getNbDayInMonth(GTimeStamp date) {
        switch (date.mMonth) {
            case 2: if (getNbDayInYear(date) == 365) return 28;
                    else                             return 29;
            case 4:  return 30;
            case 6:  return 30;
            case 9:  return 30;
            case 11: return 30;
            default: return 31;
        }
    }

    public static long diff(GTimeStamp date1, GTimeStamp date2) {
        GTimeStamp tmp = new GTimeStamp(date1.mYear, date1.mMonth, date1.mDay, 
                                        date1.mHour, date1.mMinute, date1.mSecond, date1.mTimeOffset);

        while (tmp.mYear - date2.mYear < 0) {
            while (tmp.mMonth < 13) {
                tmp.mDay = tmp.mDay - getNbDayInMonth(tmp);
                tmp.mMonth++;
            }
            tmp.mMonth = 1;
            tmp.mYear++;
        }

        while (tmp.mYear - date2.mYear > 0) {
            while (tmp.mMonth > 1) {
                tmp.mMonth--;
                tmp.mDay = tmp.mDay + getNbDayInMonth(tmp);
            }
            tmp.mMonth = 12;
            tmp.mDay = tmp.mDay + getNbDayInMonth(tmp);
            tmp.mYear--;
        }

        while (tmp.mMonth - date2.mMonth < 0) {
            tmp.mDay = tmp.mDay - getNbDayInMonth(tmp);
            tmp.mMonth++;
        }

        while (tmp.mMonth - date2.mMonth > 0) {
            tmp.mMonth--;
            tmp.mDay = tmp.mDay + getNbDayInMonth(tmp);
        }
        return (((tmp.mDay - date2.mDay) * 24 + tmp.mHour - date2.mHour) * 60 + tmp.mMinute - date2.mMinute) * 60 + tmp.mSecond - date2.mSecond;
    }

    public static GTimeStamp parseTimeString(String time) throws InvalidDataException {
        if (time.length() == 19) {
            return new GTimeStamp(
                    Integer.parseInt(time.substring(0,4)),
                    Integer.parseInt(time.substring(5,7)),
                    Integer.parseInt(time.substring(8,10)),
                    Integer.parseInt(time.substring(11,13)),
                    Integer.parseInt(time.substring(14,16)),
                    Integer.parseInt(time.substring(17,19)),
                    0);
        }
        else if (time.length() == 14) {
            // support for some sql formats
            return new GTimeStamp(
                    Integer.parseInt(time.substring(0,4)),
                    Integer.parseInt(time.substring(4,6)),
                    Integer.parseInt(time.substring(6,8)),
                    Integer.parseInt(time.substring(8,10)),
                    Integer.parseInt(time.substring(10,12)),
                    Integer.parseInt(time.substring(12,14)),
                    0);
        }
        else
            throw new InvalidDataException("Unknown time format: "+time);
    }

    public static String timeToString(GTimeStamp timeStamp) {
        StringBuffer time = new StringBuffer().append(timeStamp.mYear).append("-");

        if (timeStamp.mMonth<10) time.append("0");
        time.append(timeStamp.mMonth).append("-");

        if (timeStamp.mDay<10) time.append("0");
        time.append(timeStamp.mDay).append(" ");

        if (timeStamp.mHour<10) time.append("0");
        time.append(timeStamp.mHour).append(":");

        if (timeStamp.mMinute<10) time.append("0");
        time.append(timeStamp.mMinute).append(":");

        if (timeStamp.mSecond<10) time.append("0");
        time.append(timeStamp.mSecond);

        return time.toString();
    }

    public static OffsetDateTime toOffsetDateTime(GTimeStamp ts) {
        return OffsetDateTime.of(
                ts.mYear, 
                ts.mMonth, 
                ts.mDay, 
                ts.mHour, 
                ts.mMinute, 
                ts.mSecond, 
                0,
                ZoneOffset.ofTotalSeconds(ts.mTimeOffset/1000));
    }

    public static GTimeStamp fromOffsetDateTime(OffsetDateTime ts) {
        return new GTimeStamp(
                ts.getYear(), 
                ts.getMonthValue(), 
                ts.getDayOfMonth(), 
                ts.getHour(), 
                ts.getMinute(), 
                ts.getSecond(), 
                ts.getOffset().getTotalSeconds()*1000);
    }

    @SuppressWarnings("deprecation")
    public static GTimeStamp fromSqlTimestamp(Timestamp ts) {
        return new GTimeStamp(ts.getYear()+1900, ts.getMonth()+1, ts.getDate(), ts.getHours(), ts.getMinutes(), ts.getSeconds(), 0);
    }

    public static Timestamp toSqlTimestamp(GTimeStamp gts) {
        return Timestamp.valueOf( toOffsetDateTime(gts).atZoneSameInstant(ZoneId.of("Z")).toLocalDateTime() );
    }

    @SuppressWarnings("deprecation")
    public static Date toDate(GTimeStamp gts) {
        return new Date(gts.mYear-1900, gts.mMonth-1, gts.mDay, gts.mHour, gts.mMinute, gts.mSecond);
    }

    public static String timeStampToUtcString(GTimeStamp gts) {
        return toOffsetDateTime(gts).format(DateTimeFormatter.ISO_INSTANT);
    }

}