Unix time in logs, tokens, and databases
Incident timelines mix ISO-8601 strings with raw epoch fields from Redis, Postgres, or CloudWatch. A quick converter prevents off-by-one-hour mistakes when correlating deploy times with error spikes.
JWT and session expiry
JWT exp and iat claims are numeric epoch seconds. Decoding a token shows the integer; converting here tells you whether a 401 is simply clock skew or a genuinely expired refresh window.
Milliseconds in JavaScript stacks
Front-end frameworks often log performance.now() offsets or store created_at as 13-digit integers. Dividing by 1,000 before conversion is the usual fix when dates land in the year 50000+.