Let me guess, you don't know how to set the midnight time in Java?
You are lucky because in this article, we will cover how to initialize a date-time object with time set as the start of the day or midnight or at 00:00:00 AM in Java.
- We will do so using the legacy
java.util.Date and Calendar class
- We will also cover how this can be achieved using Java 8
java.time classes like Instant, ZoneId, LocalDate etc.
When we say set time to start of day or midnight, we mean, if the date today is 3rd September 2019, and the time is any time of the say, when I run my code, I should get the date and time as 3rd September 2019 00:00:00 AM i.e. the time of the start of the current day.
How to Set Time to Midnight (00:00:00) in Java
Using java.util.Calendar class
This can be achieved using the Calendar class, but at times when we set the timezone to our specific timezone after creating a Calendar class instance, the results tend to vary. But if your usecase doesn't worry about the timezone factor you can use this approach. Here is the code for it,
Using the java.time Package classes
With Java 8, the new java.time package was introduced which came with many better options than java.util.Date and java.util.Calendar class. The java.time package is close to joda-time library which provides many advanced functions for date and time processing.
Here is the code utilizing the java.time classes:
You can use the following code too, to get the same output. In the code below we have used java.time.LocalDateTime class doesn't consider the timezone, so if you don't care about the timezone and want minimum code for some sample application, use it.
import java.time.LocalTime;
import java.time.LocalDateTime;
LocalDateTime now = LocalDateTime.now();
System.out.println(now.with(LocalTime.MIN)); // 2019-09-03T00:00
System.out.println(now.with(LocalTime.MIDNIGHT)); // 2019-09-03T00:00
Using Joda-time
If your project uses the joda-time jar file, you can use the following code for accomplishing this, although we recommend using the second technique where we use the java.time package classes.
import org.joda.time.*;
DateTime now = new DateTime();
DateTime firstMomentOfToday = now.withTimeAtStartOfDay();
System.out.println( "now: " + now );
System.out.println( "firstMomentOfToday: " + firstMomentOfToday );
Output:
now: 2019-09-03T23:00:23.785-08:00
firstMomentOfToday: 2019-09-03T00:00:00.000-08:00
Hope this article helped you with this. And one of the above-specified ways proved useful. If it did, then do share it around or bookmark it for later.
Freqeuntly Asked Questions(FAQs)
1. How to set the time to midnight in Java?
To set the time to midnight (00:00) in Java, you can use the LocalTime class and the of method to create a specific time instance.
LocalTime midnight = LocalTime.of(0, 0);
2. How do you set a specific time on Java?
To set a specific time in Java, you can use the LocalTime class and the of method to create a time instance with the desired hour, minute, and second values.
LocalTime specificTime = LocalTime.of(9, 30, 0);
3. How to set time based on TimeZone Java?
To set the time based on a specific time zone in Java, you can use the ZonedDateTime class along with the ZoneId class. Like the following code sets the current time based on the "America/New_York" time zone. -
ZoneId timeZone = ZoneId.of("America/New_York");
ZonedDateTime currentTime = ZonedDateTime.now(timeZone);
4. How to set time in LocalDateTime Java?
To set the time in a LocalDateTime object in Java, you can use the withHour, withMinute, and withSecond methods to modify the existing object. Here's an example:
LocalDateTime dateTime = LocalDateTime.now();
LocalDateTime newDateTime = dateTime.withHour(10).withMinute(30).withSecond(0);
This example sets the time to 10:30:00, while keeping the date portion unchanged.
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