計算兩個時間之間相差幾天 月 年

chronounit類

//

獲取當前時間（2021-06-22）
localdate today =localdate.now();
//將string轉localdatetime
datetimeformatter df = datetimeformatter.ofpattern("yyyy-mm-dd");
localdate collecttimedate = localdate.parse("2021-05-01",df);
//判斷相差多少天
log.info("chronounit====相差{}年，相差{}月，相差{}天",
chronounit.years.between(collecttimedate,today),
chronounit.months.between(collecttimedate,today),
chronounit.days.between(collecttimedate,today));

結果：

//

獲取當前時間(2021-06-22 17:27:03)
localdatetime today =localdatetime.now();
//將string轉localdatetime
datetimeformatter df = datetimeformatter.ofpattern("yyyy-mm-dd hh:mm:ss");
localdatetime collecttimedate = localdatetime.parse("2021-05-01 16:40:23",df);
//判斷相差多少天
log.info("chronounit====相差{}年，相差{}月，相差{}天",
chronounit.years.between(collecttimedate,today),
chronounit.months.between(collecttimedate,today),
chronounit.days.between(collecttimedate,today));
log.info("chronounit====相差{}小時，相差{}分鐘，相差{}秒",
chronounit.hours.between(collecttimedate,today),
chronounit.minutes.between(collecttimedate,today),
chronounit.seconds.between(collecttimedate,today));
log.info("chronounit====相差{}半天",chronounit.half_days.between(collecttimedate,today));

period類

//

獲取當前時間(2021-06-22)
localdate todaydate =localdate.now();
//將string轉localdatetime
datetimeformatter dtf = datetimeformatter.ofpattern("yyyy-mm-dd");
localdate lastdate = localdate.parse("2021-05-01",dtf);
//判斷相差多少天
log.info("period====相差{}年，相差{}月，相差{}天",
period.between(lastdate,todaydate).getyears(),
period.between(lastdate,todaydate).getmonths(),
period.between(lastdate,todaydate).getdays());

結果：

從結果中可看到，兩個時間本是相差52天，但此處只顯示相差21天；因為此處只用兩者的日相減，不管年份和月份

duration類

//

獲取當前時間(2021-06-22 17:27:03)
localdatetime currentdate =localdatetime.now();
//將string轉localdatetime
datetimeformatter formatter = datetimeformatter.ofpattern("yyyy-mm-dd hh:mm:ss");
localdatetime date = localdatetime.parse("2021-05-01 16:40:23",formatter);
log.info("duration====相差{}天，相差{}小時，相差{}分鐘",
duration.between(date,currentdate).todays(),
duration.between(date,currentdate).tohours(),
duration.between(date,currentdate).tominutes());

以下這種會報錯：

//

獲取當前時間(2021-06-22)
localdate currentdate =localdate.now();
//將string轉localdate
datetimeformatter formatter = datetimeformatter.ofpattern("yyyy-mm-dd");
localdate date = localdate.parse("2021-05-01",formatter);
//判斷相差多少天
log.info("duration====相差{}天", duration.between(date,currentdate).todays());

綜上，推薦使用chronounit類

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