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

in getEndOfDay, you can add:

calendar.set(Calendar.MILLISECOND, 999);

Although mathematically speaking, you can't specify the end of a day other than by saying it's "before the beginning of the next day".

So instead of saying, if(date >= getStartOfDay(today) && date <= getEndOfDay(today)), you should say: if(date >= getStartOfDay(today) && date < getStartOfDay(tomorrow)). That is a much more solid definition (and you don't have to worry about millisecond precision).