is it right to say ?

[houssam-ph]

is it right to use a plural form after the word adjective first like for example " the first days of the year" ?

[smelvanzq]

I believe yes.. First days of the year are jan 01, 02, 03... -no specific number of days

first two days of the year are jan 01, 02. with specific number of days.

Please comment if I am wrong tnx

[Barb_D]

You're correct. It's fine.