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In my code I need to find all my things that happened today. So I need to compare against dates from today at 00:00am (midnight early this morning) to 12:00pm (midnight tonight).

I know ...

Date today = new Date(); 

... gets me right now. And ...

Date beginning = new Date(0);

... gets me zero time on Jan 1, 1970. But what's an easy way to get zero time today and zero time tomorrow?

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For sake of completeness, if you are using Java 8 you can also use the truncatedTo method of the Instant class to get midnight in UTC.

Instant.now().truncatedTo(ChronoUnit.DAYS);

As written in the Javadoc

For example, truncating with the MINUTES unit will round down to the nearest minute, setting the seconds and nanoseconds to zero.

Hope it helps.

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