TOS, it sounds like you're confusing the expiration date of the actual medicine with the earliest date they will refill your scrip. The expiration date just tells you how long the T is good for.
As long as you're not injecting more than you're supposed to, you should have no trouble getting a refill well before you actually need to start the new vial.
With that said, Strohecker's does sometimes short-date their T, as Cowboi has said. So you wind up sending them a scrip on, say, the first of January, and it's supposed to last you for, say, six months--but the expiration date is March 31st. Technically, you're not supposed to use the T after that date, yet you still have three months to go and three months' worth of injections in the vial. If this ever happens to you, send them an e-mail explaining that they short-dated your vial, and your T is going to expire too soon. They'll send out another vial so that you don't run short.
(Oh, and thanks to the guys who responded a few months ago when I posted a query about the short-dating.)
P.S. Or maybe the date you mean is the LAST date they will fill the scrip--either way, you should be fine.