//
// lastmod.js
//
// This script provides lastMod(), which gives a sensible
// string specifying the last modification time of this
// document.
// Clearly, it was stolen from someone clever.
//

function lastMod() {
    var x = new Date (document.lastModified);
    Modif = new Date(x.toGMTString());
    Year = takeYear(Modif);
    Month = Modif.getMonth();
    Day = Modif.getDate();
    Mod = (Date.UTC(Year,Month,Day,0,0,0))/86400000;
    x = new Date();
    today = new Date(x.toGMTString());
    Year2 = takeYear(today);
    Month2 = today.getMonth();
    Day2 = today.getDate();
    now = (Date.UTC(Year2,Month2,Day2,0,0,0))/86400000;
    daysago = now - Mod;
    if (daysago < 0) return '';
    unit = 'days';
    if (daysago > 730)  {
        daysago = Math.floor(daysago/365);
        unit = 'years';
    }
    else if (daysago > 60) {
        daysago = Math.floor(daysago/30);
        unit = 'months';
    }
    else if (daysago > 14) {
        daysago = Math.floor(daysago/7);
        unit = 'weeks'
    }
    var towrite = '';
    if (daysago == 0) towrite += 'today';
    else if (daysago == 1) towrite += 'yesterday';
    else towrite += daysago + ' ' + unit + ' ago';
    return towrite;
}

function takeYear(theDate) {
    x = theDate.getYear();
    var y = x % 100;
    y += (y < 38) ? 2000 : 1900;
    return y;
}