Java8 获取某月的月首和月末时间

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已于 2022-12-15 21:33:45 修改

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分类专栏： ------【Java8】文章标签： java8 LocalDateTime ZonedDateTime

于 2019-12-13 09:29:06 首次发布

本文链接：https://blog.youkuaiyun.com/weixin_41888813/article/details/103519791

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获取本月月首月末

    public static void main(String[] args) {
        LocalDateTime now = LocalDateTime.now();
        LocalDateTime startDate = now.withDayOfMonth(1).truncatedTo(ChronoUnit.DAYS);
        LocalDateTime endDate = now.plusMonths(1L).withDayOfMonth(1).truncatedTo(ChronoUnit.DAYS).plus(-1L, ChronoUnit.MILLIS);
        System.out.println(startDate);
        System.out.println(endDate);
    }

2019-12-01T00:00
2019-12-31T23:59:59.999

    public static void main(String[] args) {
        ZonedDateTime now = ZonedDateTime.now().withZoneSameInstant(ZoneId.systemDefault());
        ZonedDateTime startDate = now.withDayOfMonth(1).truncatedTo(ChronoUnit.DAYS);
        ZonedDateTime endDate = now.plusMonths(1L).withDayOfMonth(1).truncatedTo(ChronoUnit.DAYS).plus(-1L, ChronoUnit.MILLIS);
        System.out.println(startDate);
        System.out.println(endDate);
    }

2019-12-01T00:00+08:00[Asia/Shanghai]
2019-12-31T23:59:59.999+08:00[Asia/Shanghai]

获取上个月月首月末

public static void main(String[] args) {
        LocalDateTime now = LocalDateTime.now();
        LocalDateTime startDate = now.plusMonths(-1L).withDayOfMonth(1).truncatedTo(ChronoUnit.DAYS);
        LocalDateTime endDate = now.withDayOfMonth(1).truncatedTo(ChronoUnit.DAYS).truncatedTo(ChronoUnit.DAYS)
            .plus(-1L, ChronoUnit.MILLIS);
        System.out.println(startDate);
        System.out.println(endDate);
    }

2019-11-01T00:00
2019-11-30T23:59:59.999

    public static void main(String[] args) {
        ZonedDateTime now = ZonedDateTime.now().withZoneSameInstant(ZoneId.systemDefault());
        ZonedDateTime startDate = now.plusMonths(-1L).withDayOfMonth(1).truncatedTo(ChronoUnit.DAYS);
        ZonedDateTime endDate = now.withDayOfMonth(1).truncatedTo(ChronoUnit.DAYS).plus(-1L, ChronoUnit.MILLIS);
        System.out.println(startDate);
        System.out.println(endDate);
    }

2019-11-01T00:00+08:00[Asia/Shanghai]
2019-11-30T23:59:59.999+08:00[Asia/Shanghai]