Dates can be written in various ways:
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.