It was scheduled to begin at 2 p.m. ET.
"Now that we know, we can prepare as far as that and have our pregame routine and have a little more time before the game, I guess, to get ready," Bruins center Patrice Bergeron said. "I don't think it changes anything. As I said, I truly believe the League will do the best job they can to have good ice and a good environment for a good game."
The game will be televised on NBCSN, SN and TVAS.
"The decision was made to change the start time of Honda NHL Outdoors Sunday between the Bruins and Flyers in the interest of player safety due to Sunday's forecast of sunlight with no cloud cover and unseasonably warm temperatures," the NHL said in a statement.
The Bridgestone NHL Outdoors Saturday game between the Vegas Golden Knights and Colorado Avalanche was stopped after the first period because sunlight forced the ice conditions to deteriorate. Colorado defeated Vegas 3-2 after an eight-hour delay.
"It's probably a good decision that we moved it to tonight and we'll be ready to go," Avalanche captain Gabriel Landeskog told NBC. "I don't know what the afternoon is going to look like for us, but go back, get something to eat maybe and lay down for a bit. It's not the normal, but we'll figure it out. We were having fun out there."
The game Sunday between the New Jersey Devils and Washington Capitals was rescheduled to 2 p.m. ET and will be televised on NBC. It was scheduled for 7 p.m. ET.