[공통] util → framework 유틸 (ACM-CM-002)

boot/common-framework/src/main/java/com/klaro/acquirecore/framework/util/DateUtil.java

@@ -0,0 +1,85 @@
+package com.klaro.acquirecore.framework.util;
+
+import java.time.LocalDate;
+import java.time.format.DateTimeFormatter;
+import java.time.format.DateTimeParseException;
+import java.time.temporal.ChronoUnit;
+
+/**
+ * Static utility class for date operations migrated from legacy C code.
+ * Provides parsing, formatting, and calculation for LocalDate instances.
+ */
+public final class DateUtil {
+
+    private static final String DEFAULT_DATE_FORMAT = "yyyy-MM-dd";
+    private static final DateTimeFormatter DEFAULT_FORMATTER = DateTimeFormatter.ofPattern(DEFAULT_DATE_FORMAT);
+
+    private DateUtil() {
+        // Utility class - prevent instantiation
+    }
+
+    public static LocalDate parse(String dateStr) {
+        if (dateStr == null || dateStr.isBlank()) {
+            return null;
+        }
+        try {
+            return LocalDate.parse(dateStr.trim(), DEFAULT_FORMATTER);
+        } catch (DateTimeParseException e) {
+            return null;
+        }
+    }
+
+    public static String format(LocalDate date) {
+        if (date == null) {
+            return "";
+        }
+        return date.format(DEFAULT_FORMATTER);
+    }
+
+    public static String format(LocalDate date, String pattern) {
+        if (date == null || pattern == null || pattern.isBlank()) {
+            return "";
+        }
+        try {
+            return date.format(DateTimeFormatter.ofPattern(pattern));
+        } catch (IllegalArgumentException e) {
+            return "";
+        }
+    }
+
+    public static long diffDays(LocalDate from, LocalDate to) {
+        if (from == null || to == null) {
+            return 0;
+        }
+        return ChronoUnit.DAYS.between(from, to);
+    }
+
+    public static LocalDate addDays(LocalDate date, long days) {
+        if (date == null) {
+            return null;
+        }
+        return date.plusDays(days);
+    }
+
+    public static LocalDate today() {
+        return LocalDate.now();
+    }
+
+    public static boolean isValid(String dateStr) {
+        return parse(dateStr) != null;
+    }
+
+    public static boolean isBefore(LocalDate date, LocalDate before) {
+        if (date == null || before == null) {
+            return false;
+        }
+        return date.isBefore(before);
+    }
+
+    public static boolean isAfter(LocalDate date, LocalDate after) {
+        if (date == null || after == null) {
+            return false;
+        }
+        return date.isAfter(after);
+    }
+}