计算两个日期之间的工作日
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This routine is loosely based on elightbo's "Calculate Business Days" snippet in ASP, with some process & logic modifications (most notably accounting for situations when both dates fall on a weekend) and a translation to 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 }
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