Dear aalgarni2014,
Thank you very much for your suggestion.
This is already possible:
if you entered e.g.
12-01-2016 in the year field, you can determine in your citation style how you would like the date to appear:

The setting in the screenshot will display only the year
2016, the format dd-MM-yyyy the full date.
Please have a look at our
manual.
If you have any further wishes or questions, please just let us know.
Kind regards,
Jana
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