[#BloombergLP-bdlt-CalendarUtil-subtractBusinessDaysIfValid]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bdlt.adoc[bdlt]::xref:BloombergLP/bdlt/CalendarUtil.adoc[CalendarUtil]::subtractBusinessDaysIfValid
:relfileprefix: ../../../
:mrdocs:

Load, into the specified `result`, the date that is the specified `numBusinessDays` chronologically before the specified `original` date according to the specified `calendar`. The resulting date is chronologically before the `original` date for positive values of `numBusinessDays`, the chronologically latest business day that is on or before the `original` date for `0 == numBusinessDays`, and chronologically after the `original` date for negative values of `numBusinessDays`. Return 0 on success, and a non‐zero value, without modifying `*result`, if either the `original` date or the resulting date is not within the valid range of `calendar`. Note that if `0 != numBusinessDays`, then the result of `subtractBusinessDaysIfValid(res, orig, cal, numBusinessDays)` is identical to the result of `addBusinessDaysIfValid(res, orig, cal, ‐numBusinessDays)`.

== Synopsis

Declared in `<bdlt_calendarutil.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
static
int
subtractBusinessDaysIfValid(
    xref:BloombergLP/bdlt/Date.adoc[bdlt::Date]* result,
    xref:BloombergLP/bdlt/Date.adoc[bdlt::Date] const& original,
    xref:BloombergLP/bdlt/Calendar.adoc[bdlt::Calendar] const& calendar,
    int numBusinessDays);
----


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