For my personal email and calendaring system I use Gmail and Google Calendar. I was wondering why I never saw an Add to your Google Calendar option. I know those Google folks are smart and would not leave us hanging without this feature. And they didn't, they are just more intuitive and streamlined about it.
Next time you receive a confirmation in Gmail, or go back to an old email, hover your mouse over the date. You will see Add to Calendar. Click on the date and a small dialog box will open.
In the dialog box you can edit the title of the event, change the date and time (I don't know why you would) and then click Add to Calendar. No more retyping or copy and paste.