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Comment by doubleplusgood | Hacker News Reader

My personal preference would be sans TZ, since everything I can control is set to UTC immediately.

Technically "Z" postfix is a TZ identifier for UTC time. It's short and makes the timestamp compatible with RFC 3399:

    2017-04-27T09:43:04Z

Not only technically, but also practically, since many tools, libraries and service APIs accept and produce the Z as the TZ identifier for UTC.

Minus bugs, and then having the TZ (even though it always should be Z) saves your bacon.

Agreed.