Where does “दिन” come from?

दिन (Hindi) comes from Sanskrit दिन, from Proto-Indo-Aryan dinám, from Indo-Iranian *dinám, from Proto-Indo-European dyew- — to be bright; sky, heaven.

दिन (Hindi): day; day, daytime; time

Definitions

day; day, daytime; time

Ancestry of “दिन”, step by step

Step	Language	Word	Meaning
1	Sanskrit	दिन	day; cut, divided, mowed
2	Proto-Indo-Aryan	dinám	day
3	Indo-Iranian	*dinám	—
4	Proto-Indo-European	dyew-	to be bright; sky, heaven

Words derived from “दिन”

दिनचर्या
दिनभर
दिन भर
दिन-दहाड़े
निस-दिन

Every word from Proto-Indo-European dyew- →Every word from Indo-Iranian *dinám →Every word from Proto-Indo-Aryan dinám →