I want to map a layer in Google Earth Engine and the layer name should be the date the image was taken. I created a variable with the date as a string, but I always get the error that the layer name would not be a string.

Can anyone help me with this or is there a better solution to get the date as a string instead of my rather complicated way?

I am quite new with GEE.

Here is the code snippet:

var year = ee.Image(s1).getString('system:index').slice(-50, 21);
var month = ee.Image(s1).getString('system:index').slice(-46, 23);
var day = ee.Image(s1).getString('system:index').slice(-44, 25);
var date = ee.String(year.cat('-').cat(month).cat('-').cat(day))

var addDate = s1.set({'Date': date});
print('Image', addDate)

var layerName = addDate.get('Date');
print('Layer name:', layerName)

Map.addLayer(addDate, '', 'Image')
Map.addLayer(addDate, '', date)

And here is my script

Later, I want to implement this into a function for an image collection to map several images automatically with individual layer names.

1 Answer 1


This fails because date is a server-side object, and Map.addLayer() expects name to be client-side. Read up on the difference here. You can turn server-side objects into client-side with evaluate().

date.evaluate(function (clientDate) {
  Map.addLayer(addDate, '', clientDate)



Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

Not the answer you're looking for? Browse other questions tagged or ask your own question.