Note the ambiguity of the return value in the BUGS section.
From Christian Biere <christianbiere@gmx.de> in PR #39392.
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@ -30,9 +30,9 @@
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.\" SUCH DAMAGE.
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.\"
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.\" from: @(#)strftime.3 5.12 (Berkeley) 6/29/91
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.\" $NetBSD: strftime.3,v 1.24 2009/04/11 16:15:27 joerg Exp $
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.\" $NetBSD: strftime.3,v 1.25 2010/04/29 10:03:12 jruoho Exp $
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.\"
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.Dd April 14, 2004
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.Dd April 29, 2010
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.Dt STRFTIME 3
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.Os
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.Sh NAME
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@ -240,3 +240,10 @@ For example, the first week of the year 1997 lasts from
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1996-12-30 to 1997-01-05.
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.Sh BUGS
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There is no conversion specification for the phase of the moon.
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.Pp
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A return value of zero does not necessarily indicate an error.
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If the resulting string is an empty string, the result value is
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zero and it is not possible to distinguish between success and error.
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For example, in many locales
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.Cm \&%p
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yields an empty string.
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