How to obtain the start time and end time of a day?

Question

How to obtain the start time and end time of a day?

code like this is not accurate:

 private Date getStartOfDay(Date date) {
    Calendar calendar =          


        

Answer 1

java.time

Using java.time framework built into Java 8.

import java.time.LocalTime;
import java.time.LocalDateTime;

LocalDateTime now = LocalDateTime.now(); // 2015-11-19T19:42:19.224
// start of a day
now.with(LocalTime.MIN); // 2015-11-19T00:00
now.with(LocalTime.MIDNIGHT); // 2015-11-19T00:00
// end of a day
now.with(LocalTime.MAX); // 2015-11-19T23:59:59.999999999

Answer 2

I think the easiest would be something like:

// Joda Time

DateTime dateTime=new DateTime(); 

StartOfDayMillis = dateTime.withMillis(System.currentTimeMillis()).withTimeAtStartOfDay().getMillis();
EndOfDayMillis = dateTime.withMillis(StartOfDayMillis).plusDays(1).minusSeconds(1).getMillis();

These millis can be then converted into Calendar,Instant or LocalDate as per your requirement with Joda Time.