在joda時間API中比較兩個日期的問題

Question

我有一個下面的程序來比較兩個日期。

我得到的時間戳是date1和currentTimestamp，在這里我只需要比較日期而不是時間value。但是下面的程序總是返回-1。（value）

timestamp date1 = "2017-01-20 14:51:30.091"  // i get this from service call in this format

SimpleDateFormat dateFormat = new SimpleDateFormat(DEFAULT_TIMESTAMP_FORMAT);
Calendar calendar = Calendar.getInstance();
String formattedDate = dateFormat.format(calendar.getTime());
java.util.Date currentDate = dateFormat.parse(formattedDate);
java.sql.Timestamp currentTimestamp = new java.sql.Timestamp(currentDate.getTime());

int value = DateTimeComparator.getDateOnlyInstance().compare(date1 , currentTimestamp );

如何只比較日期，而不考慮時間。 請幫我。

更新：

我更改為以下代碼

timestamp date1 = "2017-01-20 14:51:30.091"  // i get this from service call in this format
 LocalDate localDate = new LocalDate();
int value = DateTimeComparator.getDateOnlyInstance().compare(date1 , localDate );

這給了我一個錯誤，說“ java.lang.IllegalArgumentException：未找到類型為org.joda.time.LocalDate的即時轉換器”

Answer 1

要比較joda沒有時間的DateTime ，您有2個選項：

• 將DateTime轉換為LocalDate 。
• 使用DateTimeComparator.getDateOnlyInstance

例如：

@Test
public void compareJodaTime() {
    DateTimeFormatter dateTimeFormatter = DateTimeFormat.forPattern("yyyy-MM-dd HH:mm:ss.SSS");

    String today = "2017-01-20 14:51:30.091";  
    String tomorrow = "2017-01-21 14:51:30.091"; 

    DateTime now = DateTime.now();

    Assert.assertThat(now.toLocalDate().compareTo(DateTime.parse(today, dateTimeFormatter).toLocalDate()), Matchers.is(0));
    Assert.assertThat(now.toLocalDate().compareTo(DateTime.parse(tomorrow, dateTimeFormatter).toLocalDate()), Matchers.is(-1));
    Assert.assertThat(now.toLocalDate().isEqual(DateTime.parse(today, dateTimeFormatter).toLocalDate()), Matchers.is(true));
    Assert.assertThat(now.toLocalDate().isBefore(DateTime.parse(tomorrow, dateTimeFormatter).toLocalDate()), Matchers.is(true));


    Assert.assertThat(DateTimeComparator.getDateOnlyInstance().compare(now, DateTime.parse(today, dateTimeFormatter)), Matchers.is(0));
    Assert.assertThat(DateTimeComparator.getDateOnlyInstance().compare(now, DateTime.parse(tomorrow, dateTimeFormatter)), Matchers.is(-1));
}

Answer 2

這不是喬達的解決方案...

使用：Apache庫'commons-lang3-xxjar'（DateUtils）

@Test
public void testCompare() {
 Date current = new Date();
 Date previous = DateUtils.addHours(DateUtils.addDays(new Date(), -1),5);
 assertEquals(1,DateUtils.truncatedCompareTo(current,previous,Calendar.DATE));
 assertEquals(0,DateUtils.truncatedCompareTo(current,current,Calendar.DATE));
 assertEquals(-1,DateUtils.truncatedCompareTo(previous,current,Calendar.DATE));
}

Answer 3

您可以使用JodaTime嘗試以下代碼： DateTime date1 = DateTime.parse("2017-01-20 14:51:30.091", DateTimeFormat.forPattern("YYYY-MM-dd HH:mm:ss.SSS")); DateTime now = new DateTime(); int value = DateTimeComparator.getDateOnlyInstance().compare(date1 , now); DateTime date1 = DateTime.parse("2017-01-20 14:51:30.091", DateTimeFormat.forPattern("YYYY-MM-dd HH:mm:ss.SSS")); DateTime now = new DateTime(); int value = DateTimeComparator.getDateOnlyInstance().compare(date1 , now);