const Duration(
{int days: 0,
int hours: 0,
int minutes: 0,
int seconds: 0,
int milliseconds: 0,
int microseconds: 0}
)

Creates a new Duration object whose value is the sum of all individual parts.

Individual parts can be larger than the next-bigger unit. For example, hours can be greater than 23.

All individual parts are allowed to be negative. All arguments are 0 by default.