Feature: (BRD-73) 시간대 규칙 TimeRule.ZONE_ID 추가

board-system-core/src/main/kotlin/com/ttasjwi/board/system/core/time/TimeRule.kt

@@ -0,0 +1,7 @@
+package com.ttasjwi.board.system.core.time
+
+import java.time.ZoneId
+
+object TimeRule {
+    val ZONE_ID: ZoneId = ZoneId.of("Asia/Seoul")
+}

board-system-core/src/main/kotlin/com/ttasjwi/board/system/core/time/impl/TimeManagerImpl.kt

@@ -2,12 +2,13 @@ package com.ttasjwi.board.system.core.time.impl
 
 import com.ttasjwi.board.system.core.annotation.component.AppComponent
 import com.ttasjwi.board.system.core.time.TimeManager
+import com.ttasjwi.board.system.core.time.TimeRule
 import java.time.ZonedDateTime
 
 @AppComponent
 class TimeManagerImpl : TimeManager {
 
     override fun now(): ZonedDateTime {
-        return ZonedDateTime.now()
+        return ZonedDateTime.now(TimeRule.ZONE_ID)
     }
 }

board-system-core/src/test/kotlin/com/ttasjwi/board/system/core/time/TimeRuleTest.kt

@@ -0,0 +1,16 @@
+package com.ttasjwi.board.system.core.time
+
+import org.assertj.core.api.Assertions.assertThat
+import org.junit.jupiter.api.DisplayName
+import org.junit.jupiter.api.Test
+import java.time.ZoneId
+
+@DisplayName("TimeRule: 우리 서비스의 시간대 규칙")
+class TimeRuleTest {
+
+    @Test
+    @DisplayName("우리 서비스의 기준 시간대는 서울 시간을 기준으로 삼는다.")
+    fun testZoneId() {
+        assertThat(TimeRule.ZONE_ID).isEqualTo(ZoneId.of("Asia/Seoul"))
+    }
+}

board-system-core/src/testFixtures/kotlin/com/ttasjwi/board/system/core/time/fixture/TimeFixture.kt

@@ -1,5 +1,6 @@
 package com.ttasjwi.board.system.core.time.fixture
 
+import com.ttasjwi.board.system.core.time.TimeRule
 import java.time.ZoneId
 import java.time.ZonedDateTime
 
@@ -11,7 +12,7 @@ fun timeFixture(
     minute: Int = 0,
     second: Int = 0,
     nanoOfSecond: Int = 0,
-    zone: ZoneId = ZoneId.of("Asia/Seoul")
+    zone: ZoneId = TimeRule.ZONE_ID
 ): ZonedDateTime {
     return ZonedDateTime.of(
         year,