How to Compare Dates Without the Time Portion?-javaTutorial-php.cn

How to Compare Dates Without the Time Portion?

Barbara Streisand

Release： 2024-11-08 07:21:01

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How to Compare Dates Without the Time Portion?

Comparing Dates Without the Time Portion

When comparing dates, it can be necessary to ignore the time portion to focus solely on the day, month, and year. This is commonly done in scenarios such as determining if two events occur on the same day. Here's how to implement a date comparison without the time:

Using Joda Time

Joda Time provides a convenient solution for date manipulation and comparison. To compare dates without the time:

DateTime first = ...;
DateTime second = ...;

LocalDate firstDate = first.toLocalDate();
LocalDate secondDate = second.toLocalDate();

return firstDate.compareTo(secondDate);

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Alternatively, use DateTimeComparator:

return DateTimeComparator.getDateOnlyInstance().compare(first, second);

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Using Java built-in API (Calendar)

If Joda Time is unavailable, use the Java built-in Calendar API:

Calendar firstDate = Calendar.getInstance();
Calendar secondDate = Calendar.getInstance();

firstDate.setTime(first);
secondDate.setTime(second);

firstDate.set(Calendar.HOUR_OF_DAY, 0);
firstDate.set(Calendar.MINUTE, 0);
firstDate.set(Calendar.SECOND, 0);
firstDate.set(Calendar.MILLISECOND, 0);

secondDate.set(Calendar.HOUR_OF_DAY, 0);
secondDate.set(Calendar.MINUTE, 0);
secondDate.set(Calendar.SECOND, 0);
secondDate.set(Calendar.MILLISECOND, 0);

return firstDate.compareTo(secondDate);

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Quick Reference for Android Developers

Add the Joda Time dependency:

dependencies {
  ...
  implementation 'joda-time:joda-time:2.9.9'
}

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Code example:

DateTimeComparator dateTimeComparator = DateTimeComparator.getDateOnlyInstance();

Date myDateOne = ...;
Date myDateTwo = ...;

int retVal = dateTimeComparator.compare(myDateOne, myDateTwo);

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