How to get first day of the month from current Date(java.util.Date)?

Question

Want to get the first day of month from current date.

To get that I'm doing with org.apache.commons.lang3.time.DateUtils to return in below format

DateUtils.truncate(new Date(), 2);

this is returning expected output like below:

Fri Jul 01 00:00:00 IST 2022

Is any other way to get the 1st day of the current month with the same above date time format?

You should stop using `Date`, for it's obsolete. Use classes from the `java.time` package. In your case probably `ZonedDateTime`. — MC Emperor, Jul 11 '22 at 07:31
Or possibly `LocalDate`, depending on how you want to handle time zones... (The requirements are really unclear at the moment.) — Jon Skeet, Jul 11 '22 at 07:34
"...with the same above date time format" - Note that formats are a matter of string representation, i.e. they depend on a couple of things like timezone, locale etc. A date object (ideally one of the java.time versions) never has a _format_, it just represents a point in time. — Thomas, Jul 11 '22 at 07:36
`String output = YearMonth.now(ZONE).atDay(1).atStartOfDay(ZONE).format(DateTimeFormatter.ofPattern("EEE MMM dd HH:mm:ss zzz y", Locale.ROOT))`. Set `ZONE` to your desired time zone. When I set it to `ZoneId.of("Asia/Kolkata")`, I got `Fri Jul 01 00:00:00 IST 2022`. — Ole V.V., Jul 11 '22 at 08:30

score 5 · Answer 1 · edited Jul 11 '22 at 07:44

5

You can use java.time.LocalDate.

LocalDate myLocalDate = LocalDate.now();
myLocalDate.withDayOfMonth(1));

Alternatively, use YearMonth.

YearMonth myYearMonth = YearMonth.now() ;
LocalDate myLocalDate = myYearMonth.atDay( 1 ) ;

edited Jul 11 '22 at 07:44

Basil Bourque

answered Jul 11 '22 at 07:34

sm3sher

score 1 · Answer 2 · answered Jul 11 '22 at 09:02

If you are in jdk8, you can use java.time.LocalDate.

LocalDate now = LocalDate.now();
LocalDate res = now.with(TemporalAdjusters.firstDayOfMonth());
System.out.println(res);

If the result type you want is Date.

ZoneId zone = ZoneId.systemDefault();
Instant instant = localDate.atStartOfDay().atZone(zone).toInstant();
return Date.from(instant);

score 0 · Answer 3 · answered Jul 11 '22 at 07:54

If you still want to use older Date library then :

        Calendar calendar =Calendar.getInstance();
        calendar.set(Calendar.DAY_OF_MONTH,1);
        System.out.println(calendar.getTime());

Output:(time zone varies based on your locale)

Fri Jul 01 08:54:39 BST 2022

3 Answers3