java date issue

[TonyStarkShaDiao]

My parameter is date in java. It seems that it cannot be converted to timestamp

it's error: java.lang.IllegalArgumentException: Unexpected token (VALUE_NUMBER_INT), expected VALUE_STRING: Can not deserialize instance of com.google.protobuf.Timestamp out of VALUE_NUMBER_INT token
at [Source: UNKNOWN; byte offset: #UNKNOWN]

please help me ! thx