Is it possible to save datetime to DynamoDB?

Okay, I see that DynamoDB does not support any date types. So the only solution is to use unix-like time as integer, or save date as string.

According to the documentation: http://docs.aws.amazon.com/amazondynamodb/latest/developerguide/JavaSDKHighLevel.html

Date S (string type). The Date values are stored as ISO-8601 formatted strings.

According to alejandro-franco response .isoformat() make the trick.

Just tested and this a working example:

CustomerPreferenceTable.put_item(
    Item={
        "id": str(uuid4()),
        "validAfter": datetime.utcnow().isoformat(),
        "validBefore": (datetime.utcnow() + timedelta(days=365)).isoformat(),
        "tags": ["potato", "eggplant"]
    }
)