Dates format

  1. On July 15=
    (On July the fifteenth)
    (On July fifteenth)
    (On the July fifteenth)

  2. On 15th July=
    (On the fifteenth of July)
    (On fifteenth of July)
    (On fifteenth of the July)

  3. On July 15th=
    (On July fifteenth)
    (On the July fifteenth)
    (On July the fifteenth)

  4. On 15 July=
    (On fifteenth of July)
    (On the fifteenth of July)
    (On fifteenth of the July)

Hi,
Would you please be nice enough to check the parenthesis written by me and let me know if they work or not?
Just please tell me which ones are incorrect. (I mean the parenthesis’)

Thank you.

  1. On July 10=
    (On July the tenth)
    (On July ten)

  2. On 15th July=
    (On the fifteenth of July)

We usually use ‘the’ before ordinals like tenth, fifteenth, fist, next, last etc.

I would say that only these are acceptable:

On July 15=
On the fifteenth of July.
On July (the) fifteenth*.

Note that it’s unusual to write “15 July”, the usual way is “July 15” (or July 15th).

PS: Turns out this is a BrE vs AmE thing again: in BrE it’s “15th July”, in AmE it’s “July 15” :))
englishclub.com/vocabulary/time-date.htm

Thanks.
I wish one native English speaker would answer it.

Tort has provided excellent advice.