Currently mongo shell and server processes might log timestamps in two different formats:

• kISO8601UTC, e.g.:

  {"t":{"$date":"2025-02-27T10:37:10.816Z"},"s":"I",  "c":"-",        "id":8991200, "ctx":"main","msg":"Shuffling initializers","attr":{"seed":2040222315}}
  

• kISO8601Local, e.g.:

  {"t":{"$date":"2025-02-27T10:37:10.913+00:00"},"s":"W",  "c":"ACCESS",   "id":7539600, "svc":"-", "ctx":"main","msg":"featureFlagSecurityToken is enabled.  This flag MUST NOT be enabled in production"}
  

It looks like the same process can generate log messages in these two formats and it would be more natural to have it more uniform.