system.base.date.NextMonth Maven / Gradle / Ivy

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package system.base.date;

import java.time.LocalDate;
import java.util.Calendar;
import java.util.Date;

public class NextMonth {

    /**
     * 取当前月份的 下个月 第nextMonthDay天。 如果nextMonthDay天大于下个月的最后一天，则以下个月最后一天为准。
     *
     * @param nextMonthDay int
     * @return  LocalDate类型的日期
     */
    final public LocalDate nextMonth(int nextMonthDay) {
        LocalDate ld1 = LocalDate.now();
        int nextMonth;
        int nextyear;
        if (ld1.getMonthValue() == 12) {
            nextMonth = 1;
            nextyear = ld1.getYear() + 1;
        } else {
            nextMonth = ld1.getMonthValue() + 1;
            nextyear = ld1.getYear();
        }

        Calendar cal = Calendar.getInstance();
        cal.set(Calendar.YEAR, nextyear);
        cal.set(Calendar.MONTH, ld1.getMonthValue());
        int lastDay = cal.getActualMaximum(Calendar.DAY_OF_MONTH);

        return lastDay < nextMonthDay ? LocalDate.of(nextyear, nextMonth, lastDay)
                : LocalDate.of(nextyear, nextMonth, nextMonthDay);
    }

    /**
     * 取当前date月份的 下个月 第nextMonthDay天。 如果nextMonthDay天大于下个月的最后一天，则以下个月最后一天为准。
     *
     * @param date Date类型的日期
     * @param nextMonthDay int
     * @return LocalDate格式的日期
     */
    final public LocalDate nextMonth(Date date, int nextMonthDay) {

        LocalDate ld1 = DateService.TO.toLocalDate(date);

        nextMonthDay = nextMonthDay < 1 ? ld1.getDayOfMonth() : nextMonthDay;

        int nextMonth;
        int nextyear;
        if (ld1.getMonthValue() == 12) {
            nextMonth = 1;
            nextyear = ld1.getYear() + 1;
        } else {
            nextMonth = ld1.getMonthValue() + 1;
            nextyear = ld1.getYear();
        }

        Calendar cal = Calendar.getInstance();
        cal.set(Calendar.YEAR, nextyear);
        cal.set(Calendar.MONTH, ld1.getMonthValue());
        int lastDay = cal.getActualMaximum(Calendar.DAY_OF_MONTH);

        return lastDay < nextMonthDay ? LocalDate.of(nextyear, nextMonth, lastDay)
                : LocalDate.of(nextyear, nextMonth, nextMonthDay);
    }

    /**
     * 取当前date月份的 下个月 第nextMonthDay天。 如果nextMonthDay天大于下个月的最后一天，则以下个月最后一天为准。
     *
     * @param date Date类型的日期
     * @return LocalDate格式的日期
     */
    final public LocalDate nextMonth(Date date) {

        LocalDate ld1 = DateService.TO.toLocalDate(date);
        int nextMonth;
        int nextyear;
        if (ld1.getMonthValue() == 12) {
            nextMonth = 1;
            nextyear = ld1.getYear() + 1;
        } else {
            nextMonth = ld1.getMonthValue() + 1;
            nextyear = ld1.getYear();
        }

        Calendar cal = Calendar.getInstance();
        cal.set(Calendar.YEAR, nextyear);
        cal.set(Calendar.MONTH, ld1.getMonthValue());
        int lastDay = cal.getActualMaximum(Calendar.DAY_OF_MONTH);

        return ld1.getDayOfMonth() > lastDay ? LocalDate.of(nextyear, nextMonth, lastDay)
                : LocalDate.of(nextyear, nextMonth, ld1.getDayOfMonth());
    }

    /**
     * 保证date月份的天数。跳到指定年月(如果date的天数在于新日期最后一天，则限定于新日期的最后一天)。
     *
     * @param date Date
     * @param year int
     * @param month int
     * @return  LocalDate
     */
    final public LocalDate nextMonth_jump(Date date, int year, int month) {

        LocalDate ld1 = DateService.TO.toLocalDate(date);
        LocalDate now = LocalDate.of(year, month, 1);
        int i = ld1.getDayOfMonth() > now.lengthOfMonth()
                ? now.lengthOfMonth()
                : ld1.getDayOfMonth();
        return now.plusDays(--i);
    }
}