How do you Calculate Days Between Dates in Java 8?

Calculating Days Between Dates in Java 8

For a precise calculation of days between two dates, the Java 8 Date API offers robust solutions. Without relying on external libraries, the problem can be addressed with the following considerations:

Preventing Daylight Saving Time Errors:

Use LocalDate objects, which represent dates without time, to avoid DST fluctuations.

Input Restrictions:

Assume the input parameters are two Date instances representing dates without time.

Logical Days Versus Literal Days:

Logical Days (Calendar Days):

To calculate the logical number of days between dates, employ the DAYS.between() method from java.time.temporal.ChronoUnit:

<code class="java">LocalDate dateBefore;
LocalDate dateAfter;
long daysBetween = DAYS.between(dateBefore, dateAfter);</code>

Literal Days (24-Hour Periods):

To calculate the literal number of 24-hour days between dates (a duration), use the Duration class:

<code class="java">LocalDate today = LocalDate.now();
LocalDate yesterday = today.minusDays(1);
// Duration oneDay = Duration.between(today, yesterday); // throws exception
Duration.between(today.atStartOfDay(), yesterday.atStartOfDay()).toDays() // alternative option</code>

Additional Resources:

For further details, consult the Java SE 8 Date and Time documentation: https://docs.oracle.com/javase/8/docs/api/java/time/package-summary.html

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