CODEWITHSUNDEEP
javadatecalendar
tkyass
tkyass

Reputation: 3186

find the first occurrence of Sunday from a given date

I want to find the date of the first occurrence of a Sunday before a given date.

e.g. I have a method that excepts current date and lets say the date is today's date Tuesday 02-09-2014 and the method will return the date of the past Sunday 31-08-2014.

Is there any way that I can get it done in Java??

Thanks in advance

Upvotes: 1

Views: 190

Answers (4)

JosEduSol
JosEduSol

Reputation: 5426

Using java.util.Calendar

Substract the difference (in days) between sunday and now:

Calendar c = Calendar.getInstance();
int day = c.get( Calendar.DAY_OF_WEEK );
c.add( Calendar.DAY_OF_WEEK, Calendar.SUNDAY - day);

And you got it.

Upvotes: 0

wvdz
wvdz

Reputation: 16641

Something like this will work.

Calendar cal = Calendar.getInstance();
int diff = cal.get(Calendar.DAY_OF_WEEK) - Calendar.SUNDAY;
cal.add(Calendar.DAY_OF_MONTH, -diff);
System.out.println(cal.getTime());

Upvotes: 0

user3487063
user3487063

Reputation: 3682

Try this:

Calendar cal = Calendar.getInstance();
cal.add(Calendar.DAY_OF_WEEK, -(cal.get(Calendar.DAY_OF_WEEK) - 1));
System.out.println(cal.getTime());

Upvotes: 0

assylias
assylias

Reputation: 328598

With java 8 you can use one of the built-in TemporalAdjusters:

LocalDate today = LocalDate.now();
LocalDate previousSunday = today.with(previous(SUNDAY));
//or if today is a Sunday and you want to return today:
LocalDate previousSunday = today.with(previousOrSame(SUNDAY));

note: assumes static imports:
import static java.time.DayOfWeek.SUNDAY;
import static java.time.temporal.TemporalAdjusters.previous;

Upvotes: 1

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