How to date format dd-mmm-yyyy in print format

How to date format dd-mmm-yyyy in print format. Please provide full code. my date field name is transaction_date .

https://www.google.co.in/search?q=python+date+formatting

@rmehta
Hi,
After setting the date format dd-mmm-yyyy form system settings
I got the following error on my date picker.

Any help would be much appreciated!