Each request to Prodege APIs must be timestamped. In some cases, the request timestamp will be used to identify old and expired API requests. The “request_date” parameter will hold the request timestamp and it will also be used to generate the request signature.

The value for the “request_date” parameter is to be calculated in this manner:

```
request_date = _client_time_ + _request_time_offset_
```

where _client_time_ is your time in milliseconds, and _request_time_offset_ is the amount of time difference (in milliseconds) between your time and the ProdegeMR Server’s time. _request_time_offset_ can be determined by issuing the Lookup Request Time Offset API Call.