toICalString method
Implementation
String toICalString() {
final buffer = StringBuffer();
buffer.writeln('BEGIN:VALARM');
buffer.writeln('TRIGGER:-PT${duration.inMinutes}M');
buffer.writeln('ACTION:DISPLAY');
if (description != null) {
buffer.writeln('DESCRIPTION:$description');
}
buffer.writeln('END:VALARM');
return buffer.toString();
}