apollo-configservice/src/main/java/com/ctrip/framework/apollo/configservice/util/InstanceConfigAuditUtil.java/InstanceConfigAuditUtil/offerTimeAndLastModifiedTimeCloseEnough
class InstanceConfigAuditUtil:  private boolean offerTimeAndLastModifiedTimeCloseEnough(Date offerTime, Date lastModifiedTime) {
    return (offerTime.getTime() - lastModifiedTime.getTime()) <
        OFFER_TIME_LAST_MODIFIED_TIME_THRESHOLD_IN_MILLI;
  }