How to Calculate the Number of Days Between Two Dates in Java 8?

Calculate Days between Two Dates in Java 8

Calculating the number of days between two dates in Java can be a common task. While external libraries like JodaTime may provide convenient methods, a straightforward approach using Java 8's Date API is possible.

Restrictions:

1. Prevent errors caused by daylight saving time.
2. Inputs are two Date objects (not LocalDateTime or LocalDate).

Solution:

Logical Calendar Days:

To obtain logical calendar days, which account for month lengths and leap years, use the ChronoUnit.DAYS method:

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

Literal 24-Hour Days (Duration):

For an exact 24-hour duration between two dates, use the Duration class:

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

Additional Notes:

• If the Date objects contain time components, the atStartOfDay() method should be used to ensure accurate calculation.
• Java 8's Date API provides various other methods for date-time manipulation, including ChronoUnit.MONTHS, ChronoUnit.YEARS, and more.

For further details, refer to the Java SE 8 Date and Time documentation.

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