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-rw-r--r--lib/stdlib/doc/src/calendar.xml32
1 files changed, 32 insertions, 0 deletions
diff --git a/lib/stdlib/doc/src/calendar.xml b/lib/stdlib/doc/src/calendar.xml
index 36f0c03162..f90d8308b6 100644
--- a/lib/stdlib/doc/src/calendar.xml
+++ b/lib/stdlib/doc/src/calendar.xml
@@ -63,6 +63,14 @@
given as local time, they must be converted to universal time, in
order to get the correct value of the elapsed time between epochs.
Use of the function <c>time_difference/2</c> is discouraged.</p>
+ <p>There exists different definitions for the week of the year.
+ The calendar module contains a week of the year implementation
+ which conforms to the ISO 8601 standard. Since the week number for
+ a given date can fall on the previous, the current or on the next
+ year it is important to provide the information which year is it
+ together with the week number. The function <c>iso_week_number/0</c>
+ and <c>iso_week_number/1</c> returns a tuple of the year and the
+ week number.</p>
</description>
<section>
@@ -154,6 +162,30 @@ time() = {Hour, Minute, Second}
</desc>
</func>
<func>
+ <name>iso_week_number() -> IsoWeekNumber</name>
+ <fsummary>Compute the iso week number for the actual date</fsummary>
+ <type>
+ <v>IsoWeekNumber = {int(), int()}</v>
+ </type>
+ <desc>
+ <p>This function returns the tuple {Year, WeekNum} representing
+ the iso week number for the actual date. For determining the
+ actual date, the function <c>local_time/0</c> is used.</p>
+ </desc>
+ </func>
+ <func>
+ <name>iso_week_number(Date) -> IsoWeekNumber</name>
+ <fsummary>Compute the iso week number for the given date</fsummary>
+ <type>
+ <v>Date = date()</v>
+ <v>IsoWeekNumber = {int(), int()}</v>
+ </type>
+ <desc>
+ <p>This function returns the tuple {Year, WeekNum} representing
+ the iso week number for the given date.</p>
+ </desc>
+ </func>
+ <func>
<name>last_day_of_the_month(Year, Month) -> int()</name>
<fsummary>Compute the number of days in a month</fsummary>
<desc>