Date of response

Hi,
this depends on how you set mosaicking parameter.
If it is SIMPLE the service will “automagically” create a mosaic based od mosaicking order parameter - different parts of the image might be from different dates/scenes.
In case it is ORBIT or TILE, you can get the date in evalscript, see this example for ORBIT and this for TILE.
And you can then write these info in outputMetadata