toddler sleeping problems.

Wow.  You don't say how old your toddler is - "toddler" is a pretty wide range, depending on who's defining it at any given time. 

My toddler is on the younger side - 18 months.  This is his typical sleeping/napping schedule:

Wake - 7.30/8am

Nap - 11-1.30/2pm

(Sometimes if the first nap was short or early, he'll sleep a little more, but usually wakes up no later than 4.30pm)

Bed - 8pm, without fail, without exception

Your toddler's on such a widely different schedule, he might as well be in a different time zone than you!  And frankly, I think that's how you have to tackle it.  The first thing you need to decide is what time YOU want him to go to bed, and what time YOU want him to wake up.  (I'm not saying you'll get it, exactly, but it's nice to have a goal.)

The next part is cooperation - from both you and your husband.  If your toddler is old enough, I'd get him in on it.  Make sure he understands that his new bedtime is Xpm, and that means he's going to bed before Daddy gets home.  He will see Daddy at (lunchtime, or breakfast, whatever set time Daddy will wake up). 

Then do it.  Go through whatever bedtime routine you have, in order to get Son in bed at the appointed hour.  Do not give in to screaming, do not give in to pleading, enforce the bedtime firmly.  I realize this is easier said than typed, and that it's going to be a LOT like when your toddler was a baby, learning to sleep through the night.  I'm sorry.  It's gonna suck for a few days.  I promise it won't suck forever.

During the daytime, keep your child moving and in the sunlight.  Give him lots of activities, and try not to let him nap except early in the afternoon.  Try to give him at least four hours of awake time before bedtime again - and be aware you might need to increase that.  This is where you can be flexible, as you both try to reset his rhythms. 

Most importantly: make sure your husband is in on this plan.  He shouldn't be waking the toddler when he comes home - I'd say not even to peek in, not the first few days.  And if your son wakes up when Daddy comes home at 1am - then Daddy also needs to reinforce the new rule, immediately and with no exceptions: "Go to Bed. Go Directly to Bed.  This is not Playtime.  This is sleep time.  Love you.  Go to bed."

Like I said, this is gonna suck - for a little while.  Like I said, he's in a different time zone at the moment and you're bascially giving him "jet lag".  It typically takes one day for every hour of jet lag that a body experiences - plan on this taking at least that long. 

Good luck!