Are the semi-finals able to run into a second day in the event of bad weather, and under what circumstances?
This from BBC about today’s game explains:
There is a reserve day but they will do all they can to get the match in today - India's innings needs to be at least 20 overs to constitute a game.
If no more play is possible today, they would restart tomorrow from the point we left off at (NZ 211-5 off 46.1 overs) and play the full 50 overs per side.
However, if India start a 20-over chase tonight and the rain returns, they would resume from that point tomorrow and only have 20 overs maximum. I.e. if India face one over before rain intervenes, they would resume tomorrow with 19 overs left to make their target.