I was reading an article in The Economist and came across the phrase "Perhaps their time is come at last."
The founder of the first vegan society said in 1944 that "in time [people] will view with abhorrence the idea that men once fed on the products of animals' bodies." Many since have shared his hope. Perhaps their time is come at last.
I googled it but couldn't find any satisfactory reason as to why the author should use "Time is come" instead of "Time has come". Any ideas?