By default the Risk Matrix is created for the defined strategy for the current date. However, you can choose the date for which the risk matrix is created. This lets you run the risk matrix for the current strategy as it was on the selected date.
If you select a:
Current trade date, then the system automatically uses the real-time market data (or the frozen data if the market data source is set to SuperDerivatives and the rates in the market data pages have been frozen).
Trade date in the past, then the system uses the saved market data for the defined trade date.
You do this using the Valuation Date field.