How to use java8 date api to get dayofmonth,dayofweek,yesterday date

Hi Experts,
using java8 how can i display these date intervals...

DayOfMonth -2016-08-01(start day of month)
DayOfWeek  -2016-08-21(week start date)
Yesterday  -2016-08-22

Thanks,
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srikoteshAsked:
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gurpsbassiConnect With a Mentor Commented:
Should be easy:


Given you have:
 LocalDate now = LocalDate.now();

get first day of month by now.withDayOfMonth(1)
get week start date by now.with(WeekFields.of(Locale.getDefault()).getFirstDayOfWeek())
get yesterdays date by calling now.minusDays(1)

Each returns a LocalDate object since the LocalDate class is immutable.
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xtermieConnect With a Mentor Commented:
Java time class described in full here
http://docs.oracle.com/javase/8/docs/api/java/time/package-summary.html

For yesterday you can try to simply subtract 1000 * 60 * 60 * 24 milliseconds from the date you want to get yesterday from and format that value:
Date yesterday = new Date(System.currentTimeMillis() - 1000L * 60L * 60L * 24L));

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That's the quick-and-dirty way, and, as noted in the comments, it might break when daylight savings transitions happen (two days per year). Recommended alternatives are the Calendar API, the Joda API or the new JDK 8 time API:
LocalDate today = LocalDate.now();
LocalDate yesterday = today.minusDays(1);

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adjust accordingly if you want to find yesterday from a certain date

org.apache.commons.lang3.time.DateUtils is more intuitive and easy to use

Date date = DateUtils.addDays(new Date(), -1);
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
return sdf.format(date);

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will do the trick.
You can also create a Date() object for "yesterday":
private static final String CURRENT_DATE_FORMAT = "yyyy-MM-dd";

public final static String format(Date date) {
    DateFormat dateFormat = new SimpleDateFormat(CURRENT_DATE_FORMAT);
    return dateFormat.format(date);
}

public final static String formatToday() {
    return format(new Date());
}

public final static String formatYesterday() {
    return format(new Date(new Date().getTime() - 24*3600*1000));
}
 

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srikoteshConnect With a Mentor Author Commented:
Hi gurpsbassi,

First day of week is printing nextweek first day

get first day of month by now.withDayOfMonth(1) //2016-08-01
get week start date by now.with(WeekFields.of(Locale.getDefault()).getFirstDayOfWeek()) //2016-08-28
get yesterdays date by calling now.minusDays(1) //2016-08-23
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srikoteshAuthor Commented:
day of week should be currenweek firstday-->2016-08-21
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gurpsbassiCommented:
will try and get back to you later. In the middle of something.
You could try experimenting with it in the meantime.
1
 
srikoteshAuthor Commented:
I got day of week

LocalDate now = LocalDate.now();
            TemporalField fieldUS = WeekFields.of(Locale.US).dayOfWeek();
            System.out.println(now.with(fieldUS, 1)); // 2016-08-21 (Sunday)

//here i have used Locale.US
IS THIS CORRECT OR IT IS SPECIFIC ONE TIMEZONE
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gurpsbassiCommented:
Different cultures have different week start dates. Like USA has sundays.
Your application should know what locale you are in.
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srikoteshAuthor Commented:
Thanks
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