The macro is (slightly tweaked from the example):
ma$S(
"ayibdabx`a"aPa: 

We can copy that to 's' by selecting it and calling "sy.
We can then run the macro by @s

Try giving it a shot on the following lines
 - I need to make some slides (Due Thursday) on vim
 - I need to make some bread (Before Friday) with my dough
 - I should prepeare some slides for my next talk (Next Thursday)
 - (By Thursday) I'll need some good exampled to captivate my audience
 - I also want to entice the audience (During my talks) to give the next one a shot