mapDateTime function

DateTime? mapDateTime(dynamic map, String key, [ String? pattern ])

Returns a valid DateTime found at the specified Map key, null otherwise.

Implementation

DateTime? mapDateTime(dynamic map, String key, [String? pattern]) {
  final dynamic value = map is Map ? map[key] : null;
  if (value != null) {
    int? millis;
    if (value is int) {
      millis = value;
    } else if (value is String) {
      if (_isEpochMarker(pattern)) {
        millis = int.tryParse(value);
      } else {
        return DateTime.tryParse(value);
      }
    }
    if (millis != null) {
      return DateTime.fromMillisecondsSinceEpoch(millis, isUtc: true);
    }
  }
  return null;
}