YouTube permits linking to specific times within video, with a URL query parameter such as:
https://www.youtube.com/watch?v=jNvNgsY2mu4&t=2m3s
But the BBC’s iPlayer uses a hash fragment to achieve the same thing. For example:
http://www.bbc.co.uk/iplayer/episode/b07z8034/horizon-20162017-16-the-lost-tribes-of-humanity#playt=31m30s
And Overcast app uses a URL path segment. For example:
https://overcast.fm/+GH-vVlzhA/13:02
There are probably other hosts enabling time links in yet more ways I’m not aware of.
Shouldn’t there be a standard way that is at least formally encouraged?
Here are those URL examples as links: