UKismetMathLibrary::IsLeapYear
#include "Kismet/KismetMathLibrary.h"
Access: public
Specifiers: staticBlueprintPure
Description
Returns true if the given year is a leap year under the proleptic Gregorian calendar rules (divisible by 4, except centuries unless also divisible by 400).
Caveats & Gotchas
- • Year 1900 returns false (not a leap year — divisible by 100 but not 400). Year 2000 returns true. These are common off-by-one mistakes when porting Julian-calendar logic.
- • The function does not validate the year range — passing Year=0 or negative values produces an incorrect answer silently in Shipping.
Signature
static UE_INL_API bool IsLeapYear( int32 Year );Parameters
| Name | Type | Description | Default |
|---|---|---|---|
| Year | int32 | The year to test (1–9999). | — |
Return Type
bool Example
Display leap year status C++
int32 Year = FDateTime::Now().GetYear();
bool bLeap = UKismetMathLibrary::IsLeapYear(Year);
UE_LOG(LogTemp, Log, TEXT("%d is%s a leap year"), Year, bLeap ? TEXT("") : TEXT(" not"));Version History
Introduced in: 4.0
| Version | Status | Notes |
|---|---|---|
| 5.6 | stable | — |
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