Represents the zero xtd::time_span value. This field is read-only.
Remarks
Because the value of the Zero field is a xtd::time_span object that represents a zero time value, you can compare it with other xtd::time_span objects to determine whether the latter represent positive, non-zero, or negative time intervals. You can also use this field to initialize a xtd::time_span object to a zero time value.