Date - Weekly

An addtional option is the ability to show either the date of the sunday commencing or ending the current week
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display_date=1 // 0 = no, 1 = yes
prev=0 // 0 = show  week ending; 1 = show week commencing
moz=document.getElementById&&!document.all

function showWeek() {
today = new Date() // create new date object
year  = y2k(today.getYear()) // get current year
month = today.getMonth() // get current month
day  = today.getDate() // get current date

result=getWeek(year,month,day)

document.getElementById("array_display").innerHTML=data[result] // comment out if not used

}

function getWeek(year,month,day) {
newYear = new Date(year,0,1) // create date object for current year
offset = 8 - newYear.getDay() // get number of days of part week for start of current year
if (offset == 8){
offset = 1
}

total_days=((Date.UTC(y2k(year),month,day,0,0,0)-Date.UTC(y2k(year),0,1,0,0,0)) /1000/60/60/24)+1 // get number of days
weeknum = Math.floor((total_days-offset+7)/7) // get week number

if (weeknum == 0) { // check if first week is part of last year
year--
prevNewYear = new Date(year,0,1);
prevOffset = 8 - prevNewYear.getDay();
if (prevOffset == 2 || prevOffset == 8){
weeknum = 53
}
else{
weeknum = 52
}

}

display_string=""

if(display_date==1){ // if displaying date
current_day= today.getDay() // get current day number

if(current_day>=0){

if(prev==1){ // calculate previous start of week date
days_offset=current_day*(1000*60*60*24)
start_week=new Date(today-days_offset).toString()

display_string="Week Commencing "

}
else{ // calculate next start of week date
today2=new Date().getTime()
end_day=7 // 6 = saturday, 7 = sunday
if(current_day>=0){
days_offset= (end_day-current_day)*(1000*60*60*24)
start_week=new Date(today2+days_offset).toString()

display_string="Ends "

}
}

}

if(!moz){
for(i=0;i<10;i++){display_string+=start_week.charAt(i)}
for(i=start_week.length-5;i<start_week.length;i++){display_string+=start_week.charAt(i)}
}
else{
for(i=0;i<15;i++){display_string+=start_week.charAt(i)}
}

document.getElementById("date_display").innerHTML=display_string

}

return weeknum

}

function y2k(number){
return (number < 1000) ? number + 1900 : number
}

// -->
</script>

</HEAD>
<BODY onload="showWeek()">

<span id="date_display"></span>
<span id="array_display"></span>

</BODY>
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