fix(timestamp-format): Update readme

README.md

@@ -22,7 +22,7 @@ const durationMs = await getDuration('file://<media-path>');
 
 ### Get the media file dimensions in pixels
 
-Gets the horizontal (x) and vertical (y) pixels of the media item, either image or video. The returned media dimensions includes both the horizontal (x) length in pixels and vertical (y) length in pixels.
+Gets the horizontal (x) and vertical (y) pixels of the media item, either image or video. The returned media dimensions includes an object with both the horizontal (x) length in pixels and vertical (y) length in pixels.
 
 ```js
 import { getDimensions } from '@qeepsake/react-native-file-utils';
@@ -42,7 +42,9 @@ const mimeType = await getMimeType('file://<media-path>');
 
 ### Get the timestamp of a media item file
 
-Gets the timestamp (js Date) of the media file at the passed Uri.
+Gets the string timestamp of the media file from the passed Uri. The timestamp is usually a date retrieved
+from either the Exif date if the original datetime of the media is available or by the creation/last modified
+timestamp from the file itself.
 
 ```js
 import { getTimestamp } from '@qeepsake/react-native-file-utils';