UKismetMathLibrary::MakeDateTime

function Engine Blueprint Since 4.0

#include "Kismet/KismetMathLibrary.h"

Access: public Specifiers: staticUFUNCTIONBlueprintPure

Description

Constructs an FDateTime from individual calendar and time components. The Blueprint NativeMakeFunc for the DateTime struct — used whenever you need to create a specific timestamp.

Caveats & Gotchas

• No validation or clamping — passing Month=13 or Day=32 will produce an incorrect FDateTime without an error or assertion in shipping builds. Validate inputs before calling.
• The resulting FDateTime is not timezone-aware; UE's FDateTime is always UTC/absolute ticks. Do not assume it represents local time unless you explicitly offset it.

Signature

static ENGINE_API FDateTime MakeDateTime(int32 Year, int32 Month, int32 Day, int32 Hour = 0, int32 Minute = 0, int32 Second = 0, int32 Millisecond = 0);

Parameters

Name	Type	Description	Default
Year	int32	Four-digit year (e.g. 2025).	—
Month	int32	Month in [1,12].	—
Day	int32	Day of month in [1,31].	—
Hour	int32	Hour in [0,23].	0
Minute	int32	Minute in [0,59].	0
Second	int32	Second in [0,59].	0
Millisecond	int32	Millisecond in [0,999].	0

Return Type

FDateTime

Example

Create a specific event timestamp C++

FDateTime EventTime = UKismetMathLibrary::MakeDateTime(2025, 12, 31, 23, 59, 59, 0);
FTimespan TimeUntil = EventTime - FDateTime::UtcNow();
UE_LOG(LogTemp, Log, TEXT("Seconds until event: %lld"), TimeUntil.GetTotalSeconds());

Version History

Introduced in: 4.0

Version	Status	Notes
5.6	stable	—

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