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Bluebeard on 11/07/07

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# Calculate Business Days between two dates

/ Published in: JavaScript
`function calcBusinessDays(dDate1, dDate2) {         // input given as Date objects   var iWeeks, iDateDiff, iAdjust = 0;   if (dDate2 < dDate1) return -1;                 // error code if dates transposed   var iWeekday1 = dDate1.getDay();                // day of week  var iWeekday2 = dDate2.getDay();   iWeekday1 = (iWeekday1 == 0) ? 7 : iWeekday1;   // change Sunday from 0 to 7  iWeekday2 = (iWeekday2 == 0) ? 7 : iWeekday2;   if ((iWeekday1 > 5) && (iWeekday2 > 5)) iAdjust = 1;  // adjustment if both days on weekend   iWeekday1 = (iWeekday1 > 5) ? 5 : iWeekday1;    // only count weekdays  iWeekday2 = (iWeekday2 > 5) ? 5 : iWeekday2;   // calculate differnece in weeks (1000mS * 60sec * 60min * 24hrs * 7 days = 604800000)  iWeeks = Math.floor((dDate2.getTime() - dDate1.getTime()) / 604800000)   if (iWeekday1 <= iWeekday2) {    iDateDiff = (iWeeks * 5) + (iWeekday2 - iWeekday1)  } else {    iDateDiff = ((iWeeks + 1) * 5) - (iWeekday1 - iWeekday2)  }   iDateDiff -= iAdjust                            // take into account both days on weekend   return (iDateDiff + 1);                         // add 1 because dates are inclusive }`