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Fix: move script to js core file
This commit is contained in:
Regis Houssin
156
htdocs/core/js/dst.js
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156
htdocs/core/js/dst.js
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// Copyright (C) 2011-2012 Laurent Destailleur <eldy@users.sourceforge.net>
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// Copyright (C) 2011-2012 Regis Houssin <regis@dolibarr.fr>
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//
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// This program is free software; you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation; either version 2 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program. If not, see <http://www.gnu.org/licenses/>.
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// or see http://www.gnu.org/
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//
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//
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// \file htdocs/core/js/dst.js
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// \brief File that include javascript functions for detect user tz, dst_observed, dst_first, dst_second
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//
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$(document).ready(function () {
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// Detect and save TZ and DST
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var rightNow = new Date();
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var jan1 = new Date(rightNow.getFullYear(), 0, 1, 0, 0, 0, 0);
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var temp = jan1.toGMTString();
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var jan2 = new Date(temp.substring(0, temp.lastIndexOf(" ")-1));
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var std_time_offset = (jan1 - jan2) / (1000 * 60 * 60);
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var june1 = new Date(rightNow.getFullYear(), 6, 1, 0, 0, 0, 0);
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temp = june1.toGMTString();
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var june2 = new Date(temp.substring(0, temp.lastIndexOf(" ")-1));
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var daylight_time_offset = (june1 - june2) / (1000 * 60 * 60);
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var dst;
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if (std_time_offset == daylight_time_offset) {
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dst = "0"; // daylight savings time is NOT observed
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} else {
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dst = "1"; // daylight savings time is observed
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}
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var dst_first=DisplayDstSwitchDates('first');
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var dst_second=DisplayDstSwitchDates('second');
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//alert(dst);
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$('#tz').val(std_time_offset); // returns TZ
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$('#dst_observed').val(dst); // returns if DST is observed on summer
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$('#dst_first').val(dst_first); // returns DST first switch in year
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$('#dst_second').val(dst_second); // returns DST second switch in year
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// Detect and save screen resolution
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$('#screenwidth').val($(window).width()); // returns width of browser viewport
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$('#screenheight').val($(window).height()); // returns width of browser viewport
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});
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function DisplayDstSwitchDates(firstsecond)
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{
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var year = new Date().getYear();
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if (year < 1000) year += 1900;
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var firstSwitch = 0;
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var secondSwitch = 0;
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var lastOffset = 99;
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// Loop through every month of the current year
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for (i = 0; i < 12; i++)
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{
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// Fetch the timezone value for the month
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var newDate = new Date(Date.UTC(year, i, 0, 0, 0, 0, 0));
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var tz = -1 * newDate.getTimezoneOffset() / 60;
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// Capture when a timzezone change occurs
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if (tz > lastOffset)
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firstSwitch = i-1;
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else if (tz < lastOffset)
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secondSwitch = i-1;
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lastOffset = tz;
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}
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// Go figure out date/time occurences a minute before
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// a DST adjustment occurs
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var secondDstDate = FindDstSwitchDate(year, secondSwitch);
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var firstDstDate = FindDstSwitchDate(year, firstSwitch);
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if (firstsecond == 'first') return firstDstDate;
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if (firstsecond == 'second') return secondDstDate;
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if (firstDstDate == null && secondDstDate == null)
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return 'Daylight Savings is not observed in your timezone.';
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else
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return 'Last minute before DST change occurs in ' +
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year + ': ' + firstDstDate + ' and ' + secondDstDate;
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}
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function FindDstSwitchDate(year, month)
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{
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// Set the starting date
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var baseDate = new Date(Date.UTC(year, month, 0, 0, 0, 0, 0));
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var changeDay = 0;
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var changeMinute = -1;
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var baseOffset = -1 * baseDate.getTimezoneOffset() / 60;
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var dstDate;
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// Loop to find the exact day a timezone adjust occurs
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for (day = 0; day < 50; day++)
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{
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var tmpDate = new Date(Date.UTC(year, month, day, 0, 0, 0, 0));
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var tmpOffset = -1 * tmpDate.getTimezoneOffset() / 60;
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// Check if the timezone changed from one day to the next
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if (tmpOffset != baseOffset)
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{
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var minutes = 0;
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changeDay = day;
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// Back-up one day and grap the offset
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tmpDate = new Date(Date.UTC(year, month, day-1, 0, 0, 0, 0));
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tmpOffset = -1 * tmpDate.getTimezoneOffset() / 60;
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// Count the minutes until a timezone chnage occurs
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while (changeMinute == -1)
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{
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tmpDate = new Date(Date.UTC(year, month, day-1, 0, minutes, 0, 0));
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tmpOffset = -1 * tmpDate.getTimezoneOffset() / 60;
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// Determine the exact minute a timezone change
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// occurs
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if (tmpOffset != baseOffset)
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{
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// Back-up a minute to get the date/time just
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// before a timezone change occurs
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tmpOffset = new Date(Date.UTC(year, month,
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day-1, 0, minutes-1, 0, 0));
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changeMinute = minutes;
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break;
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}
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else
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minutes++;
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}
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// Add a month (for display) since JavaScript counts
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// months from 0 to 11
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dstDate = tmpOffset.getMonth() + 1;
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// Pad the month as needed
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if (dstDate < 10) dstDate = "0" + dstDate;
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// Add the day and year
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dstDate = year + '-' + dstDate + '-' + tmpOffset.getDate() + 'T';
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// Capture the time stamp
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tmpDate = new Date(Date.UTC(year, month,
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day-1, 0, minutes-1, 0, 0));
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dstDate += tmpDate.toTimeString().split(' ')[0] + 'Z';
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return dstDate;
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}
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}
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}
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