Remove words from a column in a file

I have file which contains something like below

5,test,2019-09-27T11:06:23Z,closed,harshavardhanc,2019-09-27T11:09:28Z,2,2
4,test,2019-09-26T16:56:40Z,closed,harshavardhanc,2019-09-26T16:57:02Z,1,1
3,test,2019-09-26T16:54:25Z,closed,harshavardhanc,2019-09-26T16:54:55Z,1,1
2,test,2019-09-26T16:52:59Z,closed,harshavardhanc,2019-09-26T16:55:19Z,1,1
1,test,2019-09-26T16:46:52Z,closed,harshavardhanc,2019-09-26T16:47:25Z,1,1

I want to trim the 3rd column 2019-09-27T11:06:23Z to 2019-09-27 Basically I want to remove time and just keep date here.

4,test,2019-09-26,closed,harshavardhanc,2019-09-26T16:57:02Z,1,1
3,test,2019-09-26,closed,harshavardhanc,2019-09-26T16:54:55Z,1,1
2,test,2019-09-26,closed,harshavardhanc,2019-09-26T16:55:19Z,1,1
1,test,2019-09-26,closed,harshavardhanc,2019-09-26T16:47:25Z,1,1

I tried using awk with gsub awk '{gsub("T","",$3);print}' test

But no luck, please help how can I achieve this.