From 8ec20295ba052e5666fc77b66c09445233943814 Mon Sep 17 00:00:00 2001
From: Hans Bolinder <hasse@erlang.org>
Date: Mon, 26 Nov 2018 13:12:26 +0100
Subject: stdlib: Let calendar:system_time_to_rfc3339() keep fractions

RFC3339 mentions in paragraph 5.1 that if certain conditions are
fulfilled, then sorting date and time strings results in a
time-ordered sequence. One of the conditions is that the strings must
have the same number of fractional second digits. This commits makes
sure this is indeed the case.
---
 lib/stdlib/doc/src/calendar.xml | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

(limited to 'lib/stdlib/doc/src')

diff --git a/lib/stdlib/doc/src/calendar.xml b/lib/stdlib/doc/src/calendar.xml
index 6b4fa7f98a..5aee635c38 100644
--- a/lib/stdlib/doc/src/calendar.xml
+++ b/lib/stdlib/doc/src/calendar.xml
@@ -403,7 +403,11 @@
 	    default is <c>second</c>. If some other unit is given
 	    (<c>millisecond</c>, <c>microsecond</c>, or
 	    <c>nanosecond</c>), the formatted string includes a
-	    fraction of a second.</p>
+	    fraction of a second. The number of fractional second
+	    digits is three, six, or nine depending on what time unit
+	    is chosen. Notice that trailing zeros are not removed from
+	    the fraction.
+            </p>
 	  </item>
 	</taglist>
         <pre>
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