[#BloombergLP-bbldc-CalendarDayCountUtil]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bbldc.adoc[bbldc]::CalendarDayCountUtil
:relfileprefix: ../../
:mrdocs:

This `struct` provides a namespace for a suite of pure functions that compute values based on dates according to enumerated day‐count conventions.

== Synopsis

Declared in `<bbldc_calendardaycountutil.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
struct CalendarDayCountUtil;
----

== Static Member Functions

[cols="1,4"]
|===
| Name| Description
| xref:BloombergLP/bbldc/CalendarDayCountUtil/daysDiff.adoc[`daysDiff`] 
| Return the (signed) number of days between the specified `beginDate` and `endDate` according to the specified day‐count `convention` with the specified `calendar` providing the definition of business days. If `beginDate <= endDate` then the result is non‐negative. The behavior is undefined unless `isSupported(convention)`, `calendar.isInRange(beginDate)`, and `calendar.isInRange(endDate)`. Note that reversing the order of `beginDate` and `endDate` negates the result and that the result is 0 when `beginDate == endDate`.
| xref:BloombergLP/bbldc/CalendarDayCountUtil/isSupported.adoc[`isSupported`] 
| Return `true` if the specified `convention` is valid for use in `daysDiff` and `yearsDiff`, and `false` otherwise.
| xref:BloombergLP/bbldc/CalendarDayCountUtil/yearsDiff.adoc[`yearsDiff`] 
| Return the (signed fractional) number of years between the specified `beginDate` and `endDate` according to the specified day‐count `convention` with the specified `calendar` providing the definition of business days. If `beginDate <= endDate` then the result is non‐negative. The behavior is undefined unless `isSupported(convention)`, `calendar.isInRange(beginDate)`, and `calendar.isInRange(endDate)`. Note that reversing the order of `beginDate` and `endDate` negates the result; specifically, `|yearsDiff(b, e, cal, c) + yearsDiff(e, b, cal, c)| <= 1.0e‐15` for all calendars `cal`, valid dates `b` and `e`, and day‐count conventions `c`.
|===



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