Overview

--I want to find out if the date to be checked is before, after, or on the day of today. --However, the date to be checked is 00:00:00, so I want to compare only the dates. --Today's date generated by new Date () is up to the time --By comparison, even if the dates are the same, if the times are different, it will not be judged on the day.

Realization method

Method to use

--Compare before and after using the method of java.util.Date --Use the well-known DateUtils from ʻorg.apache.commons.lang3`

`UseMethod`


java.util.Date.equals(Object obj)
java.util.Date.before(Date when)
java.util.Date.after(Date when)

org.apache.commons.lang3.time.DateUtils.truncate(Date date, int field)

sample

`DateUtilService.java`


public void printDate(Date targetDate) {

    //00 today:00:Get 00
    Date today = DateUtils.truncate(new Date(), Calendar.DAY_OF_MONTH);

    if (targetDate.equals(today)) {
        System.out.println("It's today.");
    } else if (targetDate.after(today)) {
        System.out.println("It is a date after today.");
    } else if (targetDate.before(today)) {
        System.out.println("It is a date before today.");
    }
}

Commentary

Enter the date you want to pad with zeros in the first argument of DateUtils.truncate
Pass Calendar.DAY_OF_MONTH as the second argument
Today's time will be 00:00:00, so the format will be the same as targetDate.
After that, check the context with equals, after, before

By the way

How to use `DateUtils.isSameDay`

If it's just the day or not, you can use DateUtils.isSameDay to compare only the dates and return a boolean without truncate at 00:00:00.

I wanted to use before and after this time, so I filled it with zeros.

When changing the position to be zero

You can change the position to zero depending on the variable passed to the second argument of DateUtils.truncate.

int field	Position to be zero
Calendar.DAY_OF_MONTH	00:00:00
Calendar.HOUR_OF_DAY	XX:00:00
Calendar.MONTH	00 a day:00:00
Calendar.YEAR	1/1 00:00:00

reference

[Java] How to truncate the hour, minute, and second of Date Class DateUtils｜org.apache.commons.lang3.time

[Java] How to set the Date time to 00:00:00