feat: 项目需求管理

nl-common/src/main/java/org/nl/common/pojo/SelectListItem.java

@@ -0,0 +1,17 @@
+package org.nl.common.pojo;
+
+import lombok.Builder;
+import lombok.Data;
+
+/**
+ * 下拉框字段
+ * @Author: lyd
+ * @Date: 2025/11/11
+ */
+@Data
+@Builder
+public class SelectListItem {
+    public String label;
+
+    public String value;
+}

nl-common/src/main/java/org/nl/common/util/CommonTimeFormatUtil.java

@@ -17,6 +17,9 @@ import cn.hutool.core.date.DateTime;
 import cn.hutool.core.date.DateUnit;
 import cn.hutool.core.date.DateUtil;
 
+import java.time.LocalDate;
+import java.time.ZoneId;
+import java.time.temporal.ChronoUnit;
 import java.util.Date;
 
 /**
@@ -180,4 +183,17 @@ public class CommonTimeFormatUtil {
         }
         return result;
     }
+
+    public static long calculateDaysBetween(Date startTime, Date endTime) {
+        // 将 Date 转换为 LocalDate
+        LocalDate startDate = startTime.toInstant()
+                .atZone(ZoneId.systemDefault())
+                .toLocalDate();
+        LocalDate endDate = endTime.toInstant()
+                .atZone(ZoneId.systemDefault())
+                .toLocalDate();
+
+        // 计算天数差
+        return ChronoUnit.DAYS.between(startDate, endDate);
+    }
 }