javascript - How to detect first day of a month with Day.js

I am building a calendar ponent in React without using any library but Day.js.

I need to detect the first weekday of the month in order to leave a gap as shown in the picture. Otherwise the first day of every month has to be Sunday. How can I detect the first weekday of the given date?

I am building a calendar ponent in React without using any library but Day.js.

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Sorted by: Reset to default 14

Day.js has built in function to achieve this

dayjs().startOf("month").day()

This method returns current month's first week day as number.

0 = Sunday, 6 = Saturday

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