how to retrieve Common data for Sentinel-1, Sentinel-2 and Landsat-8 on same study area

Question

I am an amateur to GEE, Can anyone help me the script to retrieve Common data for Sentinel-1, Sentinel-2, or Landsat-8 on the same study area? I require all the three sensor's data for same-day in the same study area. This is for comparing and validating the sentinel-1'SAR data with optical data (sentinel-2 or Landsat-8). The script should return the dates of the common acquisition by satellites in the same study area.