diff --git a/src/components/CalendarColorful/CalendarColorful.jsx b/src/components/CalendarColorful/CalendarColorful.jsx
index 1da0020..3cf23db 100644
--- a/src/components/CalendarColorful/CalendarColorful.jsx
+++ b/src/components/CalendarColorful/CalendarColorful.jsx
@@ -33,6 +33,7 @@ export const CalendarColorful = ({ onDate, deadline = String(new Date()) }) => {
       selected={Date.parse(startDate)}
       calendarClassName={s.calendarConatiner}
       popperClassName={s.popperCustomClass}
+      calendarStartDay={1}
       // formatWeekDay={day => day.substr(0, 2)}
       customInput={
         <CalendarButton