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-rw-r--r--lib/stdlib/doc/src/calendar.xml9
1 files changed, 7 insertions, 2 deletions
diff --git a/lib/stdlib/doc/src/calendar.xml b/lib/stdlib/doc/src/calendar.xml
index 8f2b6b747a..6b4fa7f98a 100644
--- a/lib/stdlib/doc/src/calendar.xml
+++ b/lib/stdlib/doc/src/calendar.xml
@@ -323,7 +323,9 @@
<type name="rfc3339_string"/>
<type name="rfc3339_time_unit"/>
<desc>
- <p>Converts an RFC 3339 timestamp into system time.</p>
+ <p>Converts an RFC 3339 timestamp into system time. The data format
+ of RFC 3339 timestamps is described by
+ <url href="https://www.ietf.org/rfc/rfc3339.txt">RFC 3339</url>.</p>
<p>Valid option:</p>
<taglist>
<tag><c>{unit, Unit}</c></tag>
@@ -378,7 +380,10 @@
<type name="rfc3339_string"/>
<type name="rfc3339_time_unit"/>
<desc>
- <p>Converts a system time into RFC 3339 timestamp.</p>
+ <p>Converts a system time into an RFC 3339 timestamp. The data format
+ of RFC 3339 timestamps is described by
+ <url href="https://www.ietf.org/rfc/rfc3339.txt">RFC 3339</url>.
+ The data format of offsets is also described by RFC 3339.</p>
<p>Valid options:</p>
<taglist>
<tag><c>{offset, Offset}</c></tag>