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.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() )
}
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