How to Calculate Days Between Dates in Java 8, Handling Daylight Saving Time and Date Objects?

Calculating Days Between Dates in Java 8

In Java 8, calculating days between two dates can be achieved using the new Date API. To cater to specific requirements, this article presents a method that addresses two constraints: preventing errors from daylight saving time and accepting input as Date objects (without time information).

Logical Calendar Days

For calculating logical calendar days, the DAYS.between() method can be employed:

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

Literal 24-Hour Days (Duration)

If the requirement is to determine literal 24-hour days (a duration), the Duration class provides a suitable alternative:

<code class="java">LocalDate today = LocalDate.now()
LocalDate yesterday = today.minusDays(1);

// Duration oneDay = Duration.between(today, yesterday); // throws an exception

Duration.between(today.atStartOfDay(), yesterday.atStartOfDay()).toDays() // another option</code>

Additional Resources

For further details on the Java SE 8 Date and Time API, refer to this comprehensive guide: Java SE 8 Date and Time

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