LocalDate, LocalDateTime 월의 1일, 말일 구하기 및 Min/Max 시간 구하기

당월 1일 및 말일 구하기

1. 1일 : firstDayOfMonth()
2. 말일 : lastDayOfMonth()
3. 00:00:00 및 23:59:59는 LocalTime.MIN 및 LocalTime.MAX 를 이용한다

import static java.time.temporal.TemporalAdjusters.*

LocalDateTime today = LocalDateTime.now();
LocalDateTime starttime = today.with(firstDayOfMonth()).with(LocalTime.MIN); // 당월 1일 00:00:00
LocalDateTime endtime = today.with(lastDayOfMonth()).with(LocalTime.MAX); // 당월 마지막날 23:59:59

 

Field Summary

FieldsModifier and TypeField and Description

static LocalTime	MAX The maximum supported LocalTime, '23:59:59.999999999'.
static LocalTime	MIDNIGHT The time of midnight at the start of the day, '00:00'.
static LocalTime	MIN The minimum supported LocalTime, '00:00'.
static LocalTime	NOON The time of noon in the middle of the day, '12:00'.

 

👍 Reference

https://docs.oracle.com/javase/8/docs/api/java/time/LocalTime.html

https://www.studytonight.com/post/set-time-to-start-of-day-or-midnight-in-java

https://docs.oracle.com/javase/8/docs/api/java/time/temporal/TemporalAdjusters.html