Starts July 20.
And runs through August 20.
US group stage games are July 22 versus Vietnam in Auckland, July 27 versus the Netherlands in Wellington, and August 1 versus Portugal in Auckland. Assuming they advance to the knockout rounds and make it to the semis, they would play the round-of-16 game on August 6 in either Sydney or Melbourne (the former if they win the group, the latter if they finish second), the quarterfinals on August 11 in Wellington or Auckland (same comment about which venue based on group stage finish), the semifinals on August 15 in Auckland, and then either the third-place game on August 19 in Brisbane or the championship game on August 20 in Sydney.
Watching this is gonna be interesting if you want to watch live due to a lot of very early morning kickoffs. New Zealand is 16 hours ahead of Eastern Daylight Time (New Zealand is UTC+12, EDT is UTC–4). It's easier to calculate the time difference using 24-hour time because, for example, it's easier to subtract 16 from 19 to figure out the time. The first two group stage games kick off at 13:00 New Zealand time, so that works out to 21:00 EDT the night before. That's not too bad. The third group stage game kicks off at 19:00 New Zealand time. That's 3:00 EDT, which is brutal. I remember getting up at 1:45 in 2002 to watch the US play Mexico in the round of 16. Not sure I can pull that off this time around.
Sydney, Melbourne, and Brisbane are all 14 hours ahead of EDT (they're UTC+10). If the US wins the group, the round of 16 game in Sydney would be at noon their time (22:00 the night before here); if they finish second, the game in Melbourne would be at 19:00 their time (5:00 the same day here). The quarterfinals back in New Zealand would be at either 13:00 or 19:30 PM their time (21:00 the night before or 3:30 the same day EDT, respectively). The US semifinal would be at 20:00 their time (4:00 the same day EDT). The third-place game is at 18:00 Australia time (again 4:00 the same day EDT) and the championship is at 20:00 their time (6:00 the same day EDT).