How many days before a United flight can you change the date?

https://community.servicetitan.com/t5/General-Office/1-888-829-1467-How-many-days-before-a-United-flight-can-you/m-p/57285#M4245

Well, United Airlines allows passengers to change flights up to 24 hours before their scheduled departure time, for free and with no penalties. After the 24-hour period, United Airlines Change Fees will be $200 to change the date and time of their flights.A simple way to change or cancel a flight without paying a fee is to do so within 24 hours of booking.