update preview

escheduler-api/src/main/java/cn/escheduler/api/service/SchedulerService.java

@@ -567,11 +567,6 @@ public class SchedulerService extends BaseService {
 
         Date startTime = now.after(scheduleParam.getStartTime()) ? now : scheduleParam.getStartTime();
         Date endTime = scheduleParam.getEndTime();
-        if (DateUtils.differSec(scheduleParam.getStartTime(),scheduleParam.getEndTime()) == 0) {
-            logger.warn("The start time must not be the same as the end");
-            putMsg(result,Status.SCHEDULE_START_TIME_END_TIME_SAME);
-            return result;
-        }
         try {
             cronExpression = CronUtils.parse2CronExpression(scheduleParam.getCrontab());
         } catch (ParseException e) {