java计算时间差 Java问题通用解决代码

java实现计算时间差

 

 

正式版：

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      /**

       * 计算时间差，求出两者相隔的时间

       *

       * @param nowDate

       *            当前时间

       * @param calculateDate

       *            计算的时间

       * @return

       */

      public static long calculateTime(Date nowDate, Date calculateDate) {

            long ret = 0;

            try {

                  long t = nowDate.getTime() - calculateDate.getTime();

                  long day = t / (1000 * 60 * 60 * 24);

                  long hour = t / (1000 * 60 * 60);

                  long minute = t / (1000 * 60);

                  long second = t / 1000;

 

                  // ret = ?

            } catch (Exception e) {

            }

            return ret;

      }

 

       /**

       * 计算时间差，求出时间相隔的天数，值是四舍五入 <br><pre>

       */

       public static long calculateTime4Days(Date nowDate, Date calculateDate) {

             long ret = 0;

             try {

                   long t = nowDate.getTime() - calculateDate.getTime();

//                long day = d / (1000 * 60 * 60 * 24);

                   // 四舍五入

                  Double td = 0.0;

                  td += t;

                   long day = Math.round(td / (1000 * 60 * 60 * 24));

                  

                  ret = day;

            } catch (Exception e) {

            }

             return ret;

      }

 

 

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#2013-6-7补充一个计算月份的，正式版：

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       //**************************************************************************

       /**

       * 计算时间差，求出时间相隔的月份 <br><pre>

       * 编写者： sven

       * Email：swnic @isoftstone.com

       * 创建时间：2013 -6- 7 下午02:21:58 </pre>

       * @param boolean isBuc 是否补充：不足一月算一月，true；不足一月不算一月，false；

       * @return long 说明

       * @throws 异常类型 说明

       */

       //**************************************************************************

       public static long calculateTime4Month(Date startDate, Date endDate, boolean isBuc) {

             long monthDiff = 0;

 

             try {

//                String start = "2011-06-12";

//                String end = "2012-06-01";

//                SimpleDateFormat fmt = new SimpleDateFormat("yyyy-MM-dd");

//                Date startDate = fmt.parse(start);

//                Date endDate = fmt.parse(end);

 

                  Calendar starCal = Calendar. getInstance();

                  starCal.setTime(startDate);

 

                   int sYear = starCal.get(Calendar.YEAR);

                   int sMonth = starCal.get(Calendar.MONTH);

                   int sDay = starCal.get(Calendar.DAY_OF_MONTH);

 

                  Calendar endCal = Calendar. getInstance();

                  endCal.setTime(endDate);

                   int eYear = endCal.get(Calendar.YEAR);

                   int eMonth = endCal.get(Calendar.MONTH);

                   int eDay = endCal.get(Calendar.DAY_OF_MONTH);

 

                  monthDiff = ((eYear - sYear) * 12 + (eMonth - sMonth));

 

//                boolean isBuc = true;

                   if (isBuc) {

                         // 不足一月不算一月减1，默认做法，参考公式

                         // 依据天数补充，不足一月算一月加1

                         if (sDay < eDay) {

                              monthDiff = monthDiff + 1;

                        } else if (sDay > eDay) {

                              monthDiff = monthDiff - 1;

                        }

                  }

            } catch (Exception e) {

            }

 

             return monthDiff;

      }

 

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参考：

cnblogs - Java中计算时间差