CODEWITHSUNDEEP
groovy
Goffer
Goffer

Reputation: 410

Generating a random date on the last day of the month

How to prepare a groovy script in which the result a random date on the last day of the month. range up from 2022-03-31 to 2050-01-31

Example

Possibilities
2022-03-31
2022-04-30
2022-05-31
and so on.
Result 2022-04-30.

I will be grateful for your help

I try:

def date = new Date()
def formattedDate = date.format("yyyy-MM-dd")
def theValue =  formattedDate

Upvotes: 1

Views: 158

Answers (2)

tim_yates
tim_yates

Reputation: 171154

Another method for fun

import java.time.LocalDate
import java.time.YearMonth
import java.time.temporal.ChronoUnit
import java.time.temporal.TemporalAdjusters
import java.util.stream.Collector
import java.util.stream.Collectors
import java.util.stream.Stream

def start = YearMonth.parse("2022-03")
def end = YearMonth.parse("2050-01")

Stream.iterate(start, s -> s.plusMonths(1))
        .limit(ChronoUnit.MONTHS.between(start, end) + 1)
        .map(m -> m.atEndOfMonth())
        .collect(Collectors.toList())
        .shuffled()
        .head()

Upvotes: 2

ernest_k
ernest_k

Reputation: 45339

This uses java.time.LocalDate methods to add to the first date a number of days (up to the number of days between the two dates). It then shifts that to the end of the month:

import java.time.*

def r = new Random();
def start = LocalDate.parse("2022-03-31") 
def end = LocalDate.parse("2050-01-31");

def randomEndDate = (start + r.nextInt((int) (end - start)))
         .plusMonths(1).withDayOfMonth(1).minusDays(1);

Upvotes: 2

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