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When running `tailscale netcheck`, the reported timestamp used to be in UTC and formatted according to RFC 3339 with a `T` to separate the date from the time: sfllaw@h2co3:~$ tailscale netcheck | head -n3 Report: * Time: 2026-06-01T21:12:32.252620138Z This is machine-readable time leaking out to the user interface. Times in normal commands are formatted for humans to read: sfllaw@h2co3:~$ date Mon 01 Jun 2026 02:39:14 PM PDT sfllaw@h2co3:~$ journalctl -t tailscaled | tail -n1 Jun 01 14:35:21 h2co3 tailscaled[3328921]: wgengine: sending TSMP disco key advertisement to 100.90.144.102 sfllaw@h2co3:~$ timedatectl show Timezone=America/Los_Angeles LocalRTC=no CanNTP=yes NTP=yes NTPSynchronized=yes TimeUSec=Mon 2026-06-01 14:38:32 PDT RTCTimeUSec=Mon 2026-06-01 14:38:32 PDT sfllaw@h2co3:~$ uptime --since 2026-05-15 07:37:45 This PR makes the times printed by the CLI commands consistent: - For `tailscale routecheck`, it now prints local time as `2026-05-15 07:37:45-07:00`. - For `netlogfmt`, it has always printed local time with a space, but now includes the time zone. - All machine-readable outputs continue to be standard RFC 3339 in UTC, i.e. `--format=json`. As part of a general cleanup, this PR also adds standard common time.Format layouts as tstime constants. Fixes #19928 Signed-off-by: Simon Law <sfllaw@tailscale.com>