[#BloombergLP-bdlt-PackedCalendar-addWeekendDay]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bdlt.adoc[bdlt]::xref:BloombergLP/bdlt/PackedCalendar.adoc[PackedCalendar]::addWeekendDay
:relfileprefix: ../../../
:mrdocs:

Add `weekendDay` to the weekend days at the January 1, 0001 transition.

== Synopsis

Declared in `<bdlt_packedcalendar.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
void
addWeekendDay(xref:BloombergLP/bdlt/DayOfWeek/Enum.adoc[DayOfWeek::Enum] weekendDay);
----

== Description

Add the specified `weekendDay` to the set of weekend days associated with the weekend‐days transition at January 1, 0001 maintained by this calendar. Create a transition at January 1, 0001 if one does not exist. See {Iterator Invalidation} for information regarding which iterators are affected by the use of this method. The behavior is undefined unless no weekend‐days transitions were added to this calendar via the `addWeekendDaysTransition` method.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *weekendDay*
| day of the week to treat as a weekend day
|===


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