toJson method
Implementation
core.Map<core.String, core.dynamic> toJson() => {
if (date != null)
'date':
"${date!.year.toString().padLeft(4, '0')}-${date!.month.toString().padLeft(2, '0')}-${date!.day.toString().padLeft(2, '0')}",
if (dateTime != null) 'dateTime': dateTime!.toUtc().toIso8601String(),
if (timeZone != null) 'timeZone': timeZone!,
};