/** * Function displays calendar for certain month and year. */ function displayCalendar(doc, mon, realYear) { var i,oneDay,day; myPage = ""; monthsList = ["January", "February", "March", "April", "May", "June", "July", "August", "September", "October", "November", "December"]; // Here we apply doom' day rule to find day of the week // See doom's day rule - the most popular algorithm myPage += "Calendar\n"; myPage += "\n"; myPage += "
\n"; myPage += ""; myPage += ""; myPage += ""; myPage += ""; myPage += ""; myPage += ""; myPage += ""; myPage += ""; myPage += ""; myPage += ""; myPage += ""; myPage += ""; for(oneDay = 1, day = 0; day != -1; ) { myPage += "\n"; for(i = 0; i < 7; i++) { day = dayOfWeek(oneDay, mon, realYear); if(i == day && day != -1) { myPage += "\n"; oneDay++; } else { myPage += "\n"; } } myPage += "\n"; } myPage += "
" + monthsList[mon-1]; myPage += ", " + realYear + "
SMTWTFS
" + "" + oneDay + "" + "  
\n"; myPage += "

\n"; myPage += "\n"; myPage += "

\n"; myPage += "\n"; doc.clear(); doc.write(myPage); doc.close(); } /** * Given month and year function returns day od the week. */ function dayOfWeek(day, mon, realYear) { var days = 31; // For January - default. var month = mon; var year = realYear - 1900; // Here we apply doom' day rule to find day of the week // See doom's day rule - the most popular algorithm var doomDay = 3 + year + Math.floor(year/4) + Math.floor((year + 300)/400) - Math.floor(year/100); if(month == 9 || month == 5) month = 14 - month; else if(month == 7 || month == 11) month = 18 - month; else if(month == 3) month = 7; else if(month == 1 || month == 2) { if(realYear%4==0 && (realYear%100 != 0 || realYear%400 ==0)) month = 29 + (month%2)*3; else month = 28 + (month%2)*3; } // Find the number of days in a month if(mon > 2 && mon < 12) // for March, ..., December days = 31 - ((mon + 2)%5)%2; else if(mon == 2) { // Is it leap year? if(realYear%4==0 && (realYear%100 != 0 || realYear%400 ==0)) days = 29; else days = 28; } if(realYear < 1900 || day < 1 || day > days || mon < 1 || mon > 12) return -1; // Conditions do not hold return Math.abs(doomDay + day - month) % 7; } /** * Create a global variable so the window object can be accessed elsewhere * in the page if necessary */ newWind = null /** * The function opens new window. */ function createWindow() { var m = calRef[0][0].selectedIndex; var y = calRef[0][1].selectedIndex; if (calRef[0][0].options[m].value == -1 || calRef[0][1].options[y].value == -1) { alert("Please specify month and year at first"); return false; } if (newWind == null) { newWind = window.open("./html/frameCalendar.html",calRef[0][0].options[m].value + "_" + calRef[0][1].options[y].value,"top=200,left=200,height=270,width=250,resizable=no"); } else { newWind.focus(); } return true; } /** * Auxiliary function to transfer date */ function vs() { window.focus(); newWind.close(); // Close the date choice window newWind = null; } /** * Function returns full year. */ function getFullYear() { var date = new Date var year = date.getYear(); return year < 1000 ? year + 1900 : year } /** * Function gets year in the current century. */ function getCenturyYear() { var date = new Date return date.getYear() % 100; }