Flutter app error - type 'Timestamp' is not a subtype of type 'DateTime'

There are various ways to convert `TimeStamp to DateTime` which differs based on the scenario.
I have tried to gather all the possible ways to convert `Firebase timeStamp` to `DateTime`. Pick which works for you.

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#### Conversion of `Firebase timestamp` to `DateTime`:

1. document['timeStamp'].toDate()
2. (document["timeStamp"] as Timestamp).toDate()

3. DateTime.fromMillisecondsSinceEpoch(document['timeStamp'].millisecondsSinceEpoch);

5. Timestamp.fromMillisecondsSinceEpoch(document['timeStamp'].millisecondsSinceEpoch).toDate();


5. If `timeStamp` is in `microseconds` use:

DateTime.fromMicrosecondsSinceEpoch(timestamp * 1000000);
6. If `timeStamp` is in `milliseconds` use:

DateTime.fromMillisecondsSinceEpoch(timestamp * 1000);
7. Add the following function in your dart file.

String formatTimestamp(Timestamp timestamp) {
var format = new DateFormat('yyyy-MM-dd'); // <- use skeleton here
return format.format(timestamp.toDate());
}
call it as `formatTimestamp(document['timestamp'])`