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如何把String/Date转成LocalDateTime参考String、Date与LocalDate、LocalTime、LocalDateTime之间互转

String、Date、LocalDateTime、Calendar与时间戳之间互相转化参考String、Date、LocalDateTime、Calendar与时间戳之间互相转化

比较方法介绍

isBefore(ChronoLocalDateTime<?> other):是否在other时间之前

isAfter(ChronoLocalDateTime<?> other):是否在other时间之后

isEqual(ChronoLocalDateTime<?> other):是否与other时间相等

toLocalDate().isLeapYear()

时间之间计算

方法1：采用Duration

Duration between(Temporal startInclusive, Temporal endExclusive)：创建对象
toDays()：endInclusive-startExclusive的天数 可正可负可为零
toHours()：endInclusive-startExclusive的小时数 可正可负可为零
toMinutes(): endInclusive-startExclusive的分钟数 可正可负可为零
toMillis(): endInclusive-startExclusive的毫秒数 可正可负可为零
toNanos(): endInclusive-startExclusive的纳秒数 可正可负可为零

方法2：采用Period
Period between(LocalDate startDateInclusive, LocalDate endDateExclusive)：创建对象
getYears()：endDateExclusive-startDateInclusive的年 可正可负可为零
getMonths()： endDateExclusive-startDateInclusive的月 可正可负可为零
getDays() ：endDateExclusive-startDateInclusive的日 可正可负可为零

具体使用：

import java.time.*;
import java.time.format.DateTimeFormatter;
import java.util.Date;/*** 测试LocalDate* @author leishen*/
public class LocalDateTest {/*** LOCAL_DATE_TIME的时间格式*/private static final DateTimeFormatter LOCAL_DATE_TIME=DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss ms ns");public static void main(String[] args){//系统默认时区ZoneId zoneId = ZoneId.systemDefault();//Date-->ZonedDateTimeZonedDateTime zonedDateTime = new Date().toInstant().atZone(zoneId);//当前时间LocalDateTime now = zonedDateTime.toLocalDateTime();LocalDateTime localDateTime = LocalDateTime.of(2024, 2, 9, 14, 59,59);//isBefore(ChronoLocalDateTime<?> other):是否在other时间之前System.out.println("local.isBefore(now) = " + localDateTime.isBefore(now));//isAfter(ChronoLocalDateTime<?> other):是否在other时间之后System.out.println("local.isAfter(now) = " + localDateTime.isAfter(now));//isEqual(ChronoLocalDateTime<?> other):是否与other时间相等System.out.println("local.isEqual(now) = " + localDateTime.isEqual(now));//判断当前时间是否是闰年System.out.println("local.toLocalDate().isLeapYear() = " + localDateTime.toLocalDate().isLeapYear());System.out.println();//between(Temporal startInclusive, Temporal endExclusive)Duration duration = Duration.between(now,localDateTime);//toDays()：endInclusive-startExclusive的天数 可正可负可为零System.out.println("duration.toDays() = " + duration.toDays());//toHours()：endInclusive-startExclusive的小时数 可正可负可为零System.out.println("duration.toHours() = " + duration.toHours());//toMinutes(): endInclusive-startExclusive的分钟数 可正可负可为零System.out.println("duration.toMinutes() = " + duration.toMinutes());//toMillis(): endInclusive-startExclusive的毫秒数 可正可负可为零System.out.println("duration.toMillis() = " + duration.toMillis());//toNanos(): endInclusive-startExclusive的纳秒数 可正可负可为零System.out.println("duration.toNanos() = " + duration.toNanos());//between(LocalDate startDateInclusive, LocalDate endDateExclusive)Period period = Period.between(now.toLocalDate(), localDateTime.toLocalDate());//getYears() endDateExclusive-startDateInclusive的年 可正可负可为零System.out.println("period.getYears() = " + period.getYears());//getMonths() endDateExclusive-startDateInclusive的月 可正可负可为零System.out.println("period.getMonths() = " + period.getMonths());//getDays() endDateExclusive-startDateInclusive的日 可正可负可为零System.out.println("period.getDays() = " + period.getDays());}}