toTzString method
Converts this date-time to a string in either local or UTC time zone.
If numChars is provided, the string will be truncated to that length.
The result carries no time zone marker - state the zone with timeZoneLabel where the value is displayed.
Implementation
String toTzString(bool inUtc, [int? numChars]) {
final s = inUtc ? toUtc().toString() : toLocal().toString();
return numChars == null ? s : s.substring(0, numChars);
}