Re: How to send all Forms responses for the last week to a specific email?
Thanks, it was a good advice to format columns with dates as text. However, as a novice, I had many issues on other preceding steps (i.e. - where to enter formula, I didn't understand what are exact outputs, etc.
As for selecting dates, I simply selected ticks for the date, entered in 'Completion_time' column of Excel (ticks(item()?['Completion_time'])), which were greater or equal to ticks for last 7 days (ticks(getPastTime(7, 'Day')).
So, here's the images with the workflow, with some refinement (needed to select specific columns, because @odata.etag and ItemInternalId fields were automatically added, so I got rid of them) and some decoration of emailed table (improved HTLM table visual style):
General flow
HTML table decoration
Selecting necessary columns