kotlin-stdlib / kotlin.time / days days Common JVM JS Native 1.3 @ExperimentalTime @DeprecatedSinceKotlin ( "1.5" , "1.8" , "1.9" ) val Int . days : Duration (source) Deprecated: Use 'Int.days' extension property from Duration.Companion instead. Returns a Duration equal to this Int number of days. Common JVM JS Native 1.3 @ExperimentalTime @DeprecatedSinceKotlin ( "1.5" , "1.8" , "1.9" ) val Long . days : Duration (source) Deprecated: Use 'Long.days' extension property from Duration.Companion instead. Returns a Duration equal to this Long number of days. Common JVM JS Native 1.3 @ExperimentalTime @DeprecatedSinceKotlin ( "1.5" , "1.8" , "1.9" ) val Double . days : Duration (source) Deprecated: Use 'Double.days' extension property from Duration.Companion instead. Returns a Duration equal to this Double number of days. Exceptions IllegalArgumentException - if this Double value is NaN .