Fixed issue with dateutils return seconds instead of milliseconds epoch

pstatus-graphql-ktor/src/main/kotlin/gov/cdc/ocio/processingstatusapi/utils/DateUtils.kt

@@ -9,21 +9,22 @@ object DateUtils {
 
     private const val DATE_FORMAT = "yyyyMMdd'T'HHmmss'Z'"
 
+    private val dateFormat = FastDateFormat.getInstance(DATE_FORMAT)
+
     /**
      * Get the epoch time from a string provided.
      *
      * @param dateStr String
      * @param fieldName String
-     * @return Long
+     * @return Long - Epoch time in milliseconds
      * @throws BadRequestException
      */
     @Throws(BadRequestException::class)
     fun getEpochFromDateString(dateStr: String, fieldName: String): Long {
         try {
-            var dateFormat = FastDateFormat.getInstance(DATE_FORMAT)
             // Parse the date string to a Date object
             val date = dateFormat.parse(dateStr)
-            return date.time // time with millisecs
+            return date.time
         } catch (e: ParseException) {
             throw BadRequestException("Failed to parse $fieldName: $dateStr.  Format should be: ${DATE_FORMAT}.")
         }