How can I set the time on my 66i?

I haven’t used it in a long time (couple of years?), though I’ve kept it charged all this time.  I just powered it up in anticipation of a trip and noticed the time in the upper-right corner is 8:30 a.m. while it’s 7:47 p.m. where I am.  How can I change it?  Or does it just need to see a GPS satellite for a few minutes to set itself?  Thanks for any tips.