Don't do anything, just return them to their normal schedule tomorrow and they will be fine.
If they are autos it will not matter in the slightest, if they are photoperiod plants it will also not really matter - one day with a broken routine is not enough to upset them or send them into flowering, for that they need at least a week of a changed light cycle to start the change in hormones to initiate flowering.
There is absolutely no need to "kill them"!