'by end of ' vs 'by the end of'?

English as a Second Language English Vocabulary, Grammar and Idioms
1

Hi,

When do you use ‘by end of the year/next week/June/etc’ and when do we use ‘by the of the year/next week/June/etc.’?

Thank you very much.

2

If written in full it should always be ‘by the end of the …’
By end of… is an abbreviation (in a similar way as ‘today is Monday 25 April’ is an abbreviation of ‘today is Monday the 25th of April’).

3

But when do we use the full form and when the abbreviation?

4

Especially in business contexts I often see short forms that do not always comply with standard grammar, so I wonder if that abbreviation can be used…

5

As I said, if written in full it should be the long form.
Otherwise there is no reason why an abbreviation cannot be used.