The date when it was discovered is irrelevant - no astronomer cares about that. You should think of it as a unique string associated with some data + coordinates.
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But it's not unique. What if we get two gravitational hits on one day? Or what if we get one on January 1, 2019 and also one on January 1, 2119?
GRBs are named in a similar fashion with simply having an additional character at the end, for example GRB171010B is the second GRB of 2017-10-10.
And the naming scheme will simply have to change in 2100 (actually probably already 2090 because the system was in use before 2000)..
Supernovae on the other hand are named with the full year followed by one or more characters to disambiguate them - for example SN1987A or SN2013EE. This is handled centrally by the IAU and takes some time, which usually means that the same object is known under many different temporary names until the official name is assigned (and only if it is an actual supernova!).