From help I know changing times is possible:
It is possible to specify a time to add or substract to a
date. The format is the one already used for the durations.
For example:
1h will add one hour
-60m will substract one hour
+1h30m will add one hour and half
-1h1m1s will substract one hour, one minute and one second
Is it possible to changes months and years as well? I've experimented using '%Xdo{,+1y}', etc but nothing is working.
Edit: Just multiplied the days by 24, thanks for the great program.