Place date in yyyy-mm-dd format at front of email attached reports

I have created a weekly summary report to be emailed to me for the domains being tracked in PowerDMARC. Currently the attached file is named domainmmdd_yyyy.pdf. If I detach and save these files I would like to be able to sort them easily for viewing in File Explorer. I would like to suggest that the file name format be yyyy-mm-dd - domain.pdf or somthing similar so that when detached and saved into a folder it would be easy to determine the order of reports (even if you cross into a new year).