Excluding time windows within a day across days

[vitalyd]

Hi,

I have time series recorded at 30s intervals for each calendar day (with the exception of weekends, but that's not overly relevant). On each of these days, the data points start at, say, 8am and end at 5pm. I'd like to summarize(, 1d, avg) this series, but define what 1d actually means; instead of it being (essentially) midnight to midnight, I'd like it to be (as an example) 10am - 3pm only. In other words, I'd like to filter out time ranges within a given day across many days.

Is that possible? I couldn't find the appropriate function (or combination of functions).

Thanks