Commercial Fixed Wing
Flight Crew Instrument; Flight Crew Air Transport Pilot (ATP); Flight Crew Multiengine
Time Pressure; Communication Breakdown
Deviation / Discrepancy - Procedural FAR; Deviation / Discrepancy - Procedural Published Material / Policy
Procedure; Human Factors; Company Policy
I received a reroute; prior to leaving ZZZ that made Crew rest that night legal by only two minutes; no longer legal Crew rest after delayed first leg. Dispatch changed flight time from block of XA:55 to XA:45 to create legal rest for that night.Looking into this; it looks like this change should have only been done with Dispatch and Captain agreement/coordination. I did not receive any contact from Dispatch or Crew Scheduling at any point about that change. Even with the change by the time we landed it was a moot point. Legal reroute was created for next day.
Air carrier Captain reported Dispatch had changed the flight block time without communicating the change with the Captain.