Dates can be written in various ways:

2017-08-29
29/08/2017
29th August, 2017
29th Aug. 2017
August 29th, 2017

I don’t like any of the above. I find them confusing. And we no longer need to write ‘st’, ‘rd’ or ‘th’ after the day.

To make it as clear as possible, I suggest you write the date as follows:

29 August 2017 or, if you like the American way of writing: August 29, 2017.