Censoring date for healthy controls in UKB Cox regression

Hi everyone,

I have come across several posts about specifying the censoring date for Cox regression and have followed the recommended guidelines described here:
https://community.ukbiobank.ac.uk/hc/en-gb/community/posts/26549469161501-Censoring-date-of-Hospital-Inpatient-Data

I have determined the censoring date for individuals in my patient group; however, I am unsure how to determine the censoring date for healthy controls. Could anyone please advise on how this should be defined for the control group based on the information provided here:
https://biobank.ndph.ox.ac.uk/ukb/exinfo.cgi?src=Data_providers_and_dates

Thank you!