Comparing Date and a LocalDateTime in Java 8

Question

I am using Java 8 and querying a Mongo database which is returning a java.util.Date object. I now want to check that the item is within the last 30 days. I'm attempting to use the new time API to make the code more update to date.

So I've written this code:

java.time.LocalDateTime aMonthAgo = LocalDateTime.now().minusDays(30)

and I have a

java.util.Date dbDate = item.get("t")

How would I compare these 2?

I'm sure I could just work with completely Dates/Calendars to do the job, or introduce joda-time. But I'd prefer to go with a nicer Java 8 solution.

Answer 1

The equivalent of Date in the new API is Instant:

Instant dbInstant = dbDate.toInstant();

You can then compare that instant with another instant:

Instant aMonthAgo = ZonedDateTime.now().minusDays(30).toInstant();
boolean withinLast30Days = dbInstant.isAfter(aMonthAgo);

Answer 2

You can convert LocalDateTime to Date by the help of Instant

Date currentDate=new Date();
LocalDateTime localDateTime = LocalDateTime.ofInstant(currentDate.toInstant(), ZoneId.systemDefault());
Date dateFromLocalDT = Date.from(localDateTime.atZone(ZoneId.systemDefault()).toInstant());

if(dateFromLocalDT.compareTo(yourDate)==0){
    System.out.println("SAME");
}