I have a workflow, it will run on weekly basis, i have to check Today is equal to some DayName. then i hav to send an email.
How can i check Today is Equal to DayName, here DayName is String.
There are not many date activities in SharePoint Designer.
There is no activity giving you the name of the day as a string which you could compare against. You will need to code your own activity if you're using SharePoint 2010, for 2013 you will need a custom WebService.
You cannot fetch name but you can get Long Date from your Date variable and using substring operation you may be able to achieve what you want.