java 求两个日期之间工作日数

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原文链接：http://www.cnblogs.com/yangchao/archive/2010/09/20/2044416.html

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本文介绍了一个用于计算两个日期间工作日天数的Java算法，通过处理日期偏移量，确保了准确地计算出不包含周末的天数。算法首先确定起始和结束日期，然后计算两日期间的总天数，最后调整结果以排除周末。

private int getWorkingDay(Calendar d1, Calendar d2) { int result = -1; if (d1.after(d2)) { // swap dates so that d1 is start and d2 is end java.util.Calendar swap = d1; d1 = d2; d2 = swap; } int betweendays = getDaysBetween(d1, d2); int charge_date = 0; int charge_start_date = 0;//开始日期的日期偏移量 int charge_end_date = 0;//结束日期的日期偏移量 // 日期不在同一个日期内 int stmp; int etmp; stmp = 7 - d1.get(Calendar.DAY_OF_WEEK); etmp = 7 - d2.get(Calendar.DAY_OF_WEEK); if (stmp != 0 && stmp != 6) {// 开始日期为星期六和星期日时偏移量为0 charge_start_date = stmp - 1; } if (etmp != 0 && etmp != 6) {// 结束日期为星期六和星期日时偏移量为0 charge_end_date = etmp - 1; } result = (getDaysBetween(this.getNextMonday(d1), this.getNextMonday(d2)) / 7) * 5 + charge_start_date - charge_end_date; System.out.println("between day is-->" + betweendays); return result; } private Calendar getNextMonday(Calendar date) { Calendar result = null; result = date; do { result = (Calendar) result.clone(); result.add(Calendar.DATE, 1); } while (result.get(Calendar.DAY_OF_WEEK) != 2); return result; } private int getDaysBetween(Calendar d1, Calendar d2) { if (d1.after(d2)) { // swap dates so that d1 is start and d2 is end java.util.Calendar swap = d1; d1 = d2; d2 = swap; } int days = d2.get(java.util.Calendar.DAY_OF_YEAR) - d1.get(java.util.Calendar.DAY_OF_YEAR); int y2 = d2.get(java.util.Calendar.YEAR); if (d1.get(java.util.Calendar.YEAR) != y2) { d1 = (java.util.Calendar) d1.clone(); do { days += d1.getActualMaximum(java.util.Calendar.DAY_OF_YEAR); d1.add(java.util.Calendar.YEAR, 1); } while (d1.get(java.util.Calendar.YEAR) != y2); } return days; }

转载于:https://www.cnblogs.com/yangchao/archive/2010/09/20/2044416.html