It’s too bad that Canon did not include an internal intervalometer in the 60D. But you can buy external meters, and they are easy to use. I’ll show you one in a second. If you don’t know the 60d Read my Canon 60d Review.
A good Canon 60d intervalometer is the Vello , and costs about $49. It works for the T2i and the 60D, as both of these intervalometer use a sub-mini connection. Once you’ve read the manual, and got the camera, and intervalometer up and running let me give you a tip about doing time-lapse with DSLR cameras like the 60D, applies to all Canon 60d intervalometer.
The best way to do it is at one second intervals. Why? Because of the flicker effect you get at longer intervals.
To minimize the effect use one exposure per one second intervals. I do not know why DSLRs do this, but it is annoying.
Also the longer the time between exposures the more likely natural light will change, affecting the exposure. These changes are not visible to the naked eye, but they happen constantly. All Canon 60d intervalometer will create the same annoying effect.
Keeping your intervals short will help to smooth things out. There is software out there that will fix the flicker but it is expensive.
Find a Canon 60d intervalometer here: Satechi TR-C Timer Remote Control for Canon EOS 60D, Digital Rebel XT, XTi, XSi, & ELAN SLR Cameras