kotlin-stdlib / kotlin.time / Duration / milliseconds milliseconds Common JVM JS Native 1.0 inline val Int . milliseconds : <ERROR CLASS> (source) Returns a Duration equal to this Int number of milliseconds. Common JVM JS Native 1.0 inline val Long . milliseconds : <ERROR CLASS> (source) Returns a Duration equal to this Long number of milliseconds. Common JVM JS Native 1.0 inline val Double . milliseconds : <ERROR CLASS> (source) Returns a Duration equal to this Double number of milliseconds. Depending on its magnitude, the value is rounded to an integer number of nanoseconds or milliseconds. Exceptions IllegalArgumentException - if this Double value is NaN . Common JVM JS Native 1.5 @ExperimentalTime @DeprecatedSinceKotlin ( "1.6" , "1.8" , "1.9" ) fun milliseconds ( value : Int ) : Duration (source) Deprecated: Use 'Int.milliseconds' extension property from Duration.Companion instead. @ExperimentalTime @DeprecatedSinceKotlin ( "1.6" , "1.8" , "1.9" ) fun milliseconds ( value : Long ) : Duration (source) Deprecated: Use 'Long.milliseconds' extension property from Duration.Companion instead. Returns a Duration representing the specified value number of milliseconds. Common JVM JS Native 1.5 @ExperimentalTime @DeprecatedSinceKotlin ( "1.6" , "1.8" , "1.9" ) fun milliseconds ( value : Double ) : Duration (source) Deprecated: Use 'Double.milliseconds' extension property from Duration.Companion instead. Returns a Duration representing the specified value number of milliseconds. Exceptions IllegalArgumentException - if the provided Double value is NaN .