UKismetMathLibrary::ToUnixTimestampDouble

function Engine Blueprint Since 4.0

#include "Kismet/KismetMathLibrary.h"

Access: public Specifiers: staticBlueprintPure

Description

Returns seconds since the Unix Epoch as a double, preserving sub-second precision lost by the int64 variant. Useful when millisecond or finer resolution is needed.

Caveats & Gotchas

• Double-precision floats have 53 bits of mantissa. For dates in 2024 the Unix timestamp is ~1.7 × 10⁹, which is representable exactly; however, the fractional seconds component may lose precision for timestamps far in the future (year 2262+).
• The same time-zone caveat applies as ToUnixTimestamp — pass a UTC FDateTime for a correct Unix timestamp.

Signature

static UE_INL_API double ToUnixTimestampDouble(const FDateTime& Time);

Parameters

Name	Type	Description	Default
Time	const FDateTime&	The FDateTime to convert.	—

Return Type

double

Example

Measure sub-second event latency C++

double T0 = UKismetMathLibrary::ToUnixTimestampDouble(UKismetMathLibrary::UtcNow());
DoSomething();
double T1 = UKismetMathLibrary::ToUnixTimestampDouble(UKismetMathLibrary::UtcNow());
UE_LOG(LogTemp, Log, TEXT("Elapsed: %.4f seconds"), T1 - T0);

Version History

Introduced in: 4.0

Version	Status	Notes
5.6	stable	—

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