java 当星期一和星期二福尔斯上星期时，请获取正确的星期开始日期和结束日期

gmxoilav 于 2023-01-07 发布在 Java

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我正在从数据库中获取周数和年份（使用函数DATE_PART（'week'，alarm_date -（interval '1 days'）* 0）AS week，DATE_PART（'year'，alarm_date）AS yearNo，符合ISO标准），并根据周数和年份，我想计算用户提供的开始日期和结束日期之间的weekStartDate和weekEndDate，其中周开始日期例如{“startDate”：“2021-12-28”，“endDate”：“2022-01-06”，“weekStartDay”：“Sunday”}

private String getWeek(LocalDate startTime, LocalDate endTime, int yearNo, int weekNumber, int weekStartDay){
        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");

        Calendar cal = Calendar.getInstance();
        // make it ISO compliant since postgres is using ISO time to calculate week number
        cal.setMinimalDaysInFirstWeek(4);
        cal.set(Calendar.YEAR, yearNo);
        cal.set(Calendar.WEEK_OF_YEAR, weekNumber);

        //ISO week starts on Monday and ends on Sunday
        cal.set(Calendar.DAY_OF_WEEK, weekStartDay);//  weekStartDay configurabale, as per 
 //user input Calendar.SUNDAY or Calendar.MONDAY or Calendar.TUEDAY; etc
        String weekStartDate = sdf.format(cal.getTime());

        cal.add(Calendar.DATE, 6);
        String weekEndDate = sdf.format(cal.getTime());

        LocalDate weekStart = LocalDate.of(Integer.valueOf(weekStartDate.substring(0, 4)),
                Integer.valueOf(weekStartDate.substring(5, 7)), Integer.valueOf(weekStartDate.substring(8)));

        if(weekStart.isBefore(startTime)) {
            weekStart = startTime;
        }

        LocalDate weekEnd = LocalDate.of(Integer.valueOf(weekEndDate.substring(0, 4)),
                Integer.valueOf(weekEndDate.substring(5, 7)), Integer.valueOf(weekEndDate.substring(8)));
        if(weekEnd.isAfter(endTime)) {
            weekEnd = endTime;
        }

        String weekStr = weekStart.toString()+"_"+weekEnd.toString();
        return weekStr;
    }

但是当weekStartDay福尔斯在上一年的最后一周时，它会给出weekStartDate和weekStartEnd的错误值，所以请建议我如何在java中设置年号

Java

来源：https://stackoverflow.com/questions/75013931/get-correct-week-start-date-and-end-date-when-monday-tuesday-falls-in-last-yea

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按热度按时间

xzlaal3s1#

Avinash，不是完整的答案，但与Tom提到的一致。自Java-8以来，可以使用许多方便的日期时间API。请根据您可能需要的确切逻辑自由定制此方法

import java.time.DayOfWeek;
    import java.time.temporal.ChronoField;
    import java.time.temporal.IsoFields;
    import static java.time.temporal.IsoFields.WEEK_OF_WEEK_BASED_YEAR;
    import java.time.LocalDate;
    import java.time.YearMonth;
    import java.time.temporal.TemporalAdjusters;
    
    public class SO75013931 {
        public static void main(String[] args) {
            System.out.println(getWeekStart(LocalDate.parse("2021-12-28"),DayOfWeek.SUNDAY));
            System.out.println(getWeekEnd(LocalDate.parse("2021-12-28"),DayOfWeek.SUNDAY));
        }
    
        //28-12-2021 TO 01-01-2022 && 02-01-2022 to 06-01-2022
        private static String getWeekStart(LocalDate localDate, DayOfWeek weekStartDay) {
            LocalDate weekStart = localDate.with(TemporalAdjusters.previous(weekStartDay));
            return weekStart.isBefore(localDate) ? localDate.toString(): weekStart.toString();
        }
        private static String getWeekEnd(LocalDate localDate, DayOfWeek weekStartDay) {
            LocalDate weekEnd = localDate.with(TemporalAdjusters.next(weekStartDay.minus(1)));
            return weekEnd.isBefore(localDate) ? localDate.toString(): weekEnd.toString();
        }
    }

This would give

    2021-12-28
    2022-01-01

Again, the idea was to recommend usage of these API's as opposed to older util API's

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java 当星期一和星期二福尔斯上星期时，请获取正确的星期开始日期和结束日期

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