toString method
override
A string representation of this object.
Some classes have a default textual representation,
often paired with a static parse function (like int.parse).
These classes will provide the textual representation as
their string representation.
Other classes have no meaningful textual representation
that a program will care about.
Such classes will typically override toString to provide
useful information when inspecting the object,
mainly for debugging or logging.
Implementation
@override
String toString() {
String two(int v) => v.toString().padLeft(2, '0');
final sec = second.toStringAsFixed(3).padLeft(6, '0');
final cal = calendar == Calendar.julian ? 'Jul.' : 'Greg.';
return '$year-${two(month)}-${two(day)} '
'${two(hour)}:${two(minute)}:$sec ($cal)';
}