Show date of modification to one cell

[Pcesarrt26]

I have a set list of items and need to have a column that shows when the last time the cell next to it was modified. In the attached example column A will always be the same, column B will be modified periodically . I need column C to show the date of last modification of each items in column B. I know this can be achieved with VBA but have not really worked with VBA much. Column A will mostly likely have ~5k items in it 

[#2 · Accepted solution]

@Pcesarrt26 

Maybe as shown in the attached file.