UKismetMathLibrary::GetTotalMilliseconds

function Engine Blueprint Since 4.0

#include "Kismet/KismetMathLibrary.h"

Access: public Specifiers: staticUFUNCTIONBlueprintPure

Description

Returns the total elapsed time of the timespan expressed as a fractional number of milliseconds. Useful for performance timing and latency measurements where you want a single numeric value.

Caveats & Gotchas

• FTimespan internally stores ticks at 100-nanosecond resolution. GetTotalMilliseconds loses sub-millisecond precision that the underlying data contains — if you need sub-ms resolution, work with FTimespan::GetTicks() directly.
• For very large timespans (days to weeks), the double result may not have enough mantissa bits to represent individual milliseconds exactly. This is rarely a practical concern but worth knowing for high-precision instrumentation.

Signature

static UE_INL_API double GetTotalMilliseconds( FTimespan A );

Parameters

Name	Type	Description	Default
A	FTimespan	The timespan to query.	—

Return Type

double

Example

Measure elapsed time in milliseconds C++

FDateTime Start = FDateTime::UtcNow();
// ... some work ...
FTimespan Elapsed = FDateTime::UtcNow() - Start;
double Ms = UKismetMathLibrary::GetTotalMilliseconds(Elapsed);
UE_LOG(LogTemp, Log, TEXT("Elapsed: %.2f ms"), Ms);

Version History

Introduced in: 4.0

Version	Status	Notes
5.6	stable	—

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