JavaScript add days to date

Hello, Thank you and greetings from Bulgaria.

Edited: So seems like when you supply a positive number as an argument (1 - 31) it will be taken directly as is. But if you supply a negative number it will be subtracted ?

Thank you.

Thank you

After an hour i found this. Helped 100%

Спасибо

Perfectly working solution this one video helpful than other websites suggested code

Thanks

Thanks a lot man. Better than all I saw on Stackoverflow.