Get # of Days since last modified

Question

Is there anyway to have a number column that shows the number of days since the item or page was last updated? I was hoping to use a calculated column where [Today]-[Modified] but that doesn't work. A workflow wouldn't work because it would have to keep
continuously running to keep that column updated.  Any ideas?
Thanks.   
Nick Hurst

Answer 1

We ended up finding some posts online suggesting using Jquery to display this information on the page.  You can put this code in your page layout to display the number of days since the page was last modified or any date field you have associated
with the page. 
What we ended up doing was creating a calculated field to just grab a date field (in our case the column 'ReviewDate') and put it in the proper format:
=TEXT([ReviewDate],"MM/DD/YYYY")
Then we added a div to the page layout that has this date but is not displayed on the page:
<div class="review-date-text" style="display:none;">
        <SharePoint:CalculatedField FieldName="ReviewDateDisplay" runat="server" ControlMode="Display"/>
</div>
Here's the code, I'm not a developer so there are probably better ways to do this but I was able to piece this together from a couple different posts:
//The following gets the number of days since article was reviewed and writes the value into a right col div
//Gets Todays date and format it as date
var today = new Date();
var dd = today.getDate();
var mm = today.getMonth();
var yyyy = today.getFullYear();
if(dd<10) {
dd='0'+dd
if(mm<10) {
mm='0'+mm
var todaysDate = new Date(yyyy,mm,dd);
//Finds the text value of the review date
//The review date is in the review-date-text div
var reviewdatetext = jQuery(".review-date-text").text();
var reviewdatetext = jQuery.trim(reviewdatetext);
//Parses the review date and formats as a new date
var dateParts = reviewdatetext.split('/')
var reviewyear = dateParts[2];
var reviewday = dateParts[1];
var reviewmonth = dateParts[0]-1;//January is 0!
var reviewDate = new Date(reviewyear,reviewmonth,reviewday);
//Finds the number of days difference between today and review date
oneDay = 24*60*60*1000; // hours*minutes*seconds*milliseconds
var diffDays = Math.round(Math.abs((todaysDate.getTime() - reviewDate.getTime())/(oneDay)));
//Appends the number of days to the review-date div in the right column
jQuery("<div class='Custom-Date-Review'>"+diffDays+" days ago</div>").appendTo("#review-date");
Works great for us, hope that helps someone else. 
Nick Hurst