Chzzk uptime is in status.

- status:IData<StreamInfo> 's openDate is real uptime.

common/src/main/kotlin/space/mori/chzzk_bot/common/utils/convertChzzkDateToLocalDateTime.kt

@@ -0,0 +1,20 @@
+package space.mori.chzzk_bot.common.utils
+
+import org.slf4j.Logger
+import org.slf4j.LoggerFactory
+import java.time.LocalDateTime
+import java.time.format.DateTimeFormatter
+import java.time.format.DateTimeParseException
+
+val logger: Logger = LoggerFactory.getLogger("convertChzzkDateToLocalDateTime")
+
+fun convertChzzkDateToLocalDateTime(chzzkDate: String): LocalDateTime? {
+    val formatter = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss")
+
+    return try {
+        LocalDateTime.parse(chzzkDate, formatter)
+    } catch(e: DateTimeParseException) {
+        logger.debug("Error to parsing date", e)
+        null
+    }
+}