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Ask HN: Does Z suffix on a timestamp stand for Zulu, Zero, or both?

3 pointsby johnnyApplePRNGover 3 years ago
Just trying to learn a bit about timestamp formatting.<p>Found some articles that claim Z is for Zero, and some that claim Z is for Zulu.<p>They&#x27;re the same Zs, right?

1 comment

eesmithover 3 years ago
<a href="https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Coordinated_Universal_Time#Time_zones" rel="nofollow">https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Coordinated_Universal_Time#Tim...</a><p>&gt; ... or by the letter Z—a reference to the equivalent nautical time zone (GMT), which has been denoted by a Z since about 1950. ... Since the NATO phonetic alphabet word for Z is &quot;Zulu&quot;, UTC is sometimes known as &quot;Zulu time&quot;.<p><a href="https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Nautical_time" rel="nofollow">https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Nautical_time</a><p>&gt; Around 1950, a letter suffix was added to the zone description, assigning Z to the zero zone, and A–M (except J) to the east and N–Y to the west (J may be assigned to local time in non-nautical applications<p>So, yes, all three are the same.<p>You might like this - <a href="https:&#x2F;&#x2F;books.google.com&#x2F;books?id=MJYc-6eqT8AC&amp;pg=RA2-PA1&amp;q=nautical%20time%20zulu" rel="nofollow">https:&#x2F;&#x2F;books.google.com&#x2F;books?id=MJYc-6eqT8AC&amp;pg=RA2-PA1&amp;q=...</a> - a USAF major in 1959 complaining about the switch to &quot;Zebra, err, I mean Zulu time kick.&quot; (And complained about switching from mph, which was good enough for the Wright brothers, to knots.)
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