fix(agent-assignment): 소속 시각 UTC 변환을 적용한다

src/main/kotlin/kr/co/vividnext/sodalive/extensions/LocalDateTimeExtensions.kt

@@ -2,6 +2,10 @@ package kr.co.vividnext.sodalive.extensions
 
 import java.time.Duration
 import java.time.LocalDateTime
+import java.time.ZoneId
+
+private val DEFAULT_KST_ZONE_ID: ZoneId = ZoneId.of("Asia/Seoul")
+private val UTC_ZONE_ID: ZoneId = ZoneId.of("UTC")
 
 fun LocalDateTime.getTimeAgoString(): String {
     val now = LocalDateTime.now()
@@ -16,3 +20,9 @@ fun LocalDateTime.getTimeAgoString(): String {
         else -> "${duration.toDays() / 365}년전"
     }
 }
+
+fun LocalDateTime.convertToUtc(timeZone: ZoneId = DEFAULT_KST_ZONE_ID): LocalDateTime {
+    return atZone(timeZone)
+        .withZoneSameInstant(UTC_ZONE_ID)
+        .toLocalDateTime()
+}