Question about exporting as a netcdf file

Hi there

I’m working with SNAP 2.0 using a ERS-2 SAR PRImage. After applying radiometric calibration, speckle filter and terrain correction I want to save my image as a netcdf file. So far so good, but I’ve managed to save only the variables latitude, longitude and sigma0. However, I need to save as well the date of the image.

My question then. How can I export a netcdf file including the date of the image?

Thank you for your time.