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

Another one solution which does not depend on any framework is:

static public Date getStartOfADay(Date day) {
    final long oneDayInMillis = 24 * 60 * 60 * 1000;
    return new Date(day.getTime() / oneDayInMillis * oneDayInMillis);
}

static public Date getEndOfADay(Date day) {
    final long oneDayInMillis = 24 * 60 * 60 * 1000;
    return new Date((day.getTime() / oneDayInMillis + 1) * oneDayInMillis - 1);
}

Note that it returns UTC based time