Here is the API response for retrieving comments of a YouTube video, taken from https://developers.google.com/youtube/2.0/developers_guide_protocol_comments:
<feed> <entry> ... <media:group> ... </media:group> <gd:comments> <gd:feedLink href='https://gdata.youtube.com/feeds/api/videos/VIDEO_ID/comments'/> </gd:comments> </entry> </feed> I am not sure which API to use to get this data. I have written my code in Python which gives me the author name and comment of a video. I want to fetch the timestamp of each comment for my research work.