~pkunal-parmar/ubuntu-calendar-app/ICalImport

/*

 * Copyright (C) 2013-2014 Canonical Ltd

 *

 * This file is part of Ubuntu Calendar App

 *

 * Ubuntu Calendar App is free software: you can redistribute it and/or modify

 * it under the terms of the GNU General Public License version 3 as

 * published by the Free Software Foundation.

 *

 * Ubuntu Calendar App 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 this program.  If not, see <http://www.gnu.org/licenses/>.

 */

.pragma library

Date.msPerDay = 86400e3

Date.msPerWeek = Date.msPerDay * 7

Date.leapYear = function(year) {

    return year % 4 == 0 && (year % 100 != 0 || year % 400 == 0)

}

Date.daysInMonth = function(year, month) {

    return [

        31/*Jan*/, 28/*Feb*/, 31/*Mar*/, 30/*Apr*/, 31/*May*/, 30/*Jun*/,

        31/*Jul*/, 31/*Aug*/, 30/*Sep*/, 31/*Oct*/, 30/*Nov*/, 31/*Dec*/

    ][month] + (month == 1) * Date.leapYear(year)

}

Date.weeksInMonth = function(year, month, weekday) {

    var y = year, m = month

    var date0 = new Date(y, m, 1)

    var date1 = new Date(y + (m == 11), m < 11 ? m + 1 : 0, 1)

    var day = date0.getDay()

    var m = (date1.getTime() - date0.getTime()) / Date.msPerDay

    var n = 0

    while (m > 0) {

        if (day == weekday) n = n + 1

        day = day < 6 ? day + 1 : 0

        m = m - 1

    }

    return n

}

Date.prototype.midnight = function() {

    var date = new Date(this)

    date.setHours(0,0,0,0);

    return date

}

Date.prototype.endOfDay = function() {

    var date = new Date(this)

    date.setHours(23,59,59,0);

    return date

}

Date.prototype.addDays = function(days) {

    var date = new Date(this)

    date.setDate(date.getDate() + days);

    return date

}

Date.prototype.addMonths = function(months) {

    var date = new Date(this)

    date.setMonth(date.getMonth() + months)

    return date

}

Date.prototype.weekStart = function(weekStartDay) {

    var date = this.midnight()

    var day = date.getDay(), n = 0

    while (day != weekStartDay) {

        if (day == 0) day = 6

        else day = day - 1

        n = n + 1

    }

    return date.addDays(-n)

}

Date.prototype.monthStart = function() {

    return this.midnight().addDays(1 - this.getDate())

}

Date.prototype.weekNumber = function() {

    var date = this.weekStart(1).addDays(3) // Thursday midnight

    var newYear = new Date(date.getFullYear(), 0 /*Jan*/, 1 /*the 1st*/)

    var n = 0

    var tx = date.getTime(), tn = newYear.getTime()

    while (tn < tx) {

        tx = tx - Date.msPerWeek

        n = n + 1

    }

    return n

}

Date.prototype.weeksInMonth = function(weekday) {

    return Date.weeksInMonth(this.getFullYear(), this.getMonth(), weekday)

}

Date.prototype.isSameDay = function ( otherDay ) {

    return ( this.getDate() === otherDay.getDate()

    && this.getMonth() === otherDay.getMonth()

    && this.getFullYear() === otherDay.getFullYear() );

}

Date.prototype.mergeDate = function (d) {

    this.setFullYear(d.getFullYear());

    this.setMonth(d.getMonth());

    this.setDate(d.getDate());

}

function weekCount(year, month_number) {

    var firstOfMonth = new Date(year, month_number, 1);

    var lastOfMonth = new Date(year, month_number+1, 0);

    var used = firstOfMonth.getDay() + lastOfMonth.getDate();

    return Math.ceil( used / 7);

}

function getFirstDateofWeek( year, month) {

    var date = new Date(year, month, 1);

    var first = date.getDate() - date.getDay();

    return new Date(date.setDate(first));

}

function today() {

    var date = new Date();

    date.setHours(0,0,0,0);

    return date

}

function isSameMonth(date1, date2) {

    return ( date1.getFullYear() === date2.getFullYear()

            && date1.getMonth() === date2.getMonth() )

}