How to get the date of RGB image from L8 satellite?

3

I have tried that and I get the following response:

{"metadata":"[{\\"idx\\":0,\\"bandBuffers\\":[{},{},{},{},{}]}]"}

However, previously I used to get the date here when using the same script for Sentinel 2. Here is the evalscript for that:

eval_script_rgb_json = """
//VERSION=3




let minVal = 0.0;
let maxVal = 0.4;
let viz = new HighlightCompressVisualizer(minVal, maxVal);
function evaluatePixel(samples) {
     let sudoPanW = (samples.B04 + samples.B03 + samples.B02 * 0.4) / 2.4;
     let ratioW = samples.B08 / sudoPanW;
     let val = [samples.B04 * ratioW, samples.B03 * ratioW, samples.B02 * ratioW];
     val = viz.processList(val);
     val.push(samples.dataMask); 
     return val;
}
function setup() {
     return {
          input: [{
               bands: ["B02","B03","B04","B08","dataMask" ]
          }], 
          output: { 
               bands: 4
          }
     }
}


function updateOutputMetadata(scenes, inputMetadata, outputMetadata) {
  outputMetadata.userData = { "metadata":  JSON.stringify(scenes) }
  return [0]
}

"""