From e4a18d0c798c99fd935b6a7e328a516a47064cd2 Mon Sep 17 00:00:00 2001
From: pricelees <priceelees@gmail.com>
Date: Sat, 13 Sep 2025 15:33:46 +0900
Subject: [PATCH] =?UTF-8?q?feat:=20=EC=9E=85=EB=A0=A5=EB=90=9C=20=EB=82=A0?=
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---
 .../kotlin/roomescape/common/util/DateUtils.kt    | 11 +++++++++++
 .../roomescape/common/util/DateUtilsTest.kt       | 15 +++++++++++++++
 2 files changed, 26 insertions(+)
 create mode 100644 src/main/kotlin/roomescape/common/util/DateUtils.kt
 create mode 100644 src/test/kotlin/roomescape/common/util/DateUtilsTest.kt

diff --git a/src/main/kotlin/roomescape/common/util/DateUtils.kt b/src/main/kotlin/roomescape/common/util/DateUtils.kt
new file mode 100644
index 00000000..4ad16583
--- /dev/null
+++ b/src/main/kotlin/roomescape/common/util/DateUtils.kt
@@ -0,0 +1,11 @@
+package roomescape.common.util
+
+import java.time.DayOfWeek
+import java.time.LocalDate
+import java.time.temporal.TemporalAdjusters
+
+object DateUtils {
+    fun getSundayOfPreviousWeek(date: LocalDate): LocalDate = date
+        .minusWeeks(1)
+        .with(TemporalAdjusters.previousOrSame(DayOfWeek.SUNDAY))
+}
diff --git a/src/test/kotlin/roomescape/common/util/DateUtilsTest.kt b/src/test/kotlin/roomescape/common/util/DateUtilsTest.kt
new file mode 100644
index 00000000..30a2c6b3
--- /dev/null
+++ b/src/test/kotlin/roomescape/common/util/DateUtilsTest.kt
@@ -0,0 +1,15 @@
+package roomescape.common.util
+
+import io.kotest.core.spec.style.StringSpec
+import io.kotest.matchers.shouldBe
+import java.time.LocalDate
+
+class DateUtilsTest : StringSpec({
+    "입력된 날짜의 이전 주 일요일을 찾는다." {
+        val expected = LocalDate.of(2025, 8, 31)
+
+        for (i in 7..13){
+            DateUtils.getSundayOfPreviousWeek(LocalDate.of(2025, 9, i)) shouldBe expected
+        }
+    }
+})