Nick Rowe has an excellent and timely post on DST and monetary policy:
Metrification was a nominal change that had negiligible real effects, as far as I know. Daylight Savings Time is a nominal change that has real effects. Some monetary changes, like currency reforms where we knock a couple of zeroes off the old currency and call it the new currency, are like metrification, where nothing real changes. And maybe all monetary changes are like metrification in the long run. But some monetary changes are like Daylight savings Time, and have real effects, at least in the short run.
If we understood Daylight Savings Time better, and how it works, we might understand monetary policy better.
Indeed, Nick makes some progress (slightly technical) on this question, read the whole thing for more.