At the moment, Scheduled Reports can be created and sent for periods Previous Day / Previous Week / Previous month / Previous year, however, I believe it would be beneficial to allow specifying custom periods, similar to how flexible intervals currently work for items.

This feature request comes from a partner request to allow sending reports only for data collected on weekdays, during working time (1-5,09:00-18:00). As a workaround, I suggested to create items with flexible intervals (1-5,09:00-18:00), use these items in graphs on dashboards, and then use "Previous day" scheduled report period, however, this workaround will contain graphs that will be half-empty.

Please consider adding "flexible interval-like" custom periods for scheduled report generation.