Main toolbar > Open Track View > Track View toolbar > Edit Time > Select time in the Track View Edit window. > Reverse Time
Graph Editors menu > Track View > Open Track View > Track View toolbar > Edit Time > Select time in the Track View Edit window. > Reverse Time
Reverse Time flips keys within the selected time. You can reverse time by scaling a selection past its left edge but this also changes the position of the selection and the remaining keys around it. Use the Reverse Time button to reverse within a selected block of time.
Procedure
To reverse time:
On the Track View toolbar, select Edit Time.
In the Hierarchy list, select item labels to select tracks for time editing.
Select a block of time.
Click Reverse Time.
The position of the selected block of time does not change, but keys within the selection are mirrored in reverse order.
Interface
Reverse Time: Reverses keys within a selected block of time.