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This JavaScript will display a calender showing the date and time of today.

Label: Calender script that shows date and time of today

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<SCRIPT language=JavaScript>
/*
Copyright 1996 - Tomer and Yehuda Shiran
Feel free to "steal" this code provided that you leave this notice as is.
Additional examples from the book can be found at http://www.geocities.com/SiliconValley/9000/
For more information contact Tomer or Yehuda Shiran <yshiran@iil.intel.com>
*/


// Modified by Nguyen Truong Minh Chanh , photo_thinhan@yahoo.com

setCal()
function getTime() {
var now = new Date()
var hour = now.getHours()
var minute = now.getMinutes()
now = null
var ampm = "" 
if (hour >= 12) {
hour -= 12
ampm = "PM"
} else
ampm = "AM"
hour = (hour == 0) ? 12 : hour
if (minute < 10)
minute = "0" + minute 
return hour + ":" + minute + " " + ampm
}
function leapYear(year) {
if (year % 4 == 0) 
return true 
}
function getDays(month, year) {
var ar = new Array(12)
ar[0] = 31
ar[1] = (leapYear(year)) ? 29 : 28 
ar[2] = 31 
ar[3] = 30 
ar[4] = 31 
ar[5] = 30 
ar[6] = 31 
ar[7] = 31 
ar[8] = 30 
ar[9] = 31 
ar[10] = 30 
ar[11] = 31 
return ar[month]
}
function getMonthName(month) {
var ar = new Array(12)
ar[0] = "ThÃ¡ng M&#7897;t"
ar[1] = "ThÃ¡ng Hai"
ar[2] = "ThÃ¡ng Ba"
ar[3] = "ThÃ¡ng T&#432;"
ar[4] = "ThÃ¡ng N&#259;m"
ar[5] = "ThÃ¡ng SÃ¡u"
ar[6] = "ThÃ¡ng B&#7843;y"
ar[7] = "ThÃ¡ng TÃ¡m"
ar[8] = "ThÃ¡ng ChÃn"
ar[9] = "ThÃ¡ng M&#432;&#7901;i"
ar[10] = "ThÃ¡ng M&#432;&#7901;i M&#7897;t"
ar[11] = "ThÃ¡ng M&#432;&#7901;i Hai"
return ar[month]
}
function setCal() {
var now = new Date()
var year = now.getYear()
if (year < 1000)
year+=1900
var month = now.getMonth()
var monthName = getMonthName(month)
var date = now.getDate()
now = null
var firstDayInstance = new Date(year, month, 1)
var firstDay = firstDayInstance.getDay()
firstDayInstance = null
var days = getDays(month, year)
drawCal(firstDay + 1, days, date, monthName, year)
}
function drawCal(firstDay, lastDate, date, monthName, year) {
var headerHeight = 50
var border = 2 
var cellspacing = 4 
var headerColor = "midnightblue" 
var headerSize = "+3" 
var colWidth = 60 
var dayCellHeight = 25 
var dayColor = "darkblue"
var cellHeight = 40 
var todayColor = "red" 
var timeColor = "purple"
var text = "" 
text += '<CENTER>'
text += '<TABLE BORDER=' + border + ' CELLSPACING=' + cellspacing + '>' 
text += '<TH COLSPAN=7 HEIGHT=' + headerHeight + '>' 
text += '<FONT COLOR="' + headerColor + '" SIZE=' + headerSize + '>' 
text += monthName + ' ' + year 
text += '</FONT>' 
text += '</TH>' 
var openCol = '<TD WIDTH=' + colWidth + ' HEIGHT=' + dayCellHeight + '>'
openCol += '<FONT COLOR="' + dayColor + '">'
var closeCol = '</FONT></TD>'
var weekDay = new Array(7)
weekDay[0] = "Ch&#7911; Nh&#7853;t"
weekDay[1] = "Th&#7913; Hai"
weekDay[2] = "Th&#7913; Ba"
weekDay[3] = "Th&#7913; T&#432;"
weekDay[4] = "Th&#7913; N&#259;m"
weekDay[5] = "Th&#7913; SÃ¡u"
weekDay[6] = "Th&#7913; B&#7843;y"
text += '<TR ALIGN="center" VALIGN="center">'
for (var dayNum = 0; dayNum < 7; ++dayNum) {
text += openCol + weekDay[dayNum] + closeCol 
}
text += '</TR>'
var digit = 1
var curCell = 1
for (var row = 1; row <= Math.ceil((lastDate + firstDay - 1) / 7); ++row) {
text += '<TR ALIGN="right" VALIGN="top">'
for (var col = 1; col <= 7; ++col) {
if (digit > lastDate)
break
if (curCell < firstDay) {
text += '<TD></TD>';
curCell++
} else {
if (digit == date) { 
text += '<TD HEIGHT=' + cellHeight + '>'
text += '<FONT COLOR="' + todayColor + '">'
text += digit
text += '</FONT><BR>'
text += '<FONT COLOR="' + timeColor + '" SIZE=2>'
text += '<CENTER>' + getTime() + '</CENTER>'
text += '</FONT>'
text += '</TD>'
} else
text += '<TD HEIGHT=' + cellHeight + '>' + digit + '</TD>'
digit++
}
}
text += '</TR>'
}
text += '</TABLE>'
text += '</CENTER>'
document.write(text) 
}
</SCRIPT>
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