There is a pretty helpful section in the manual here: 25 Transitioning from BUGS | Stan User’s Guide
If you can take stab at writing out the Stan code and provide your OS, version of Stan, R or python that you are using.
There are a number of survival model examples written for Stan. See here:
https://ermeel86.github.io/case_studies/surv_stan_example.html
https://rstudio-pubs-static.s3.amazonaws.com/435225_07b4ab5afa824342a4680c9fb2de6098.html
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