Track View > Dope Sheet > Specify a time block. > Time menu > Reverse
Track View > Dope Sheet > Specify a time block. > Time: Dope Sheet toolbar > Reverse Time
Reverse Time flips the order of 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 Reverse Time to reverse keys within a designated block of time.
To reverse time:
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In Dope Sheet mode, highlight one or more item labels in the Controller window to specify tracks for time editing.
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Use Select Time to specify a block of time.
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Click the Reverse Time button, or choose Time menu > Reverse.
The position of the selected block of time does not change, but order of keys within the block is reversed.