It is really hard to reach a consensus on a meeting date when you have a decent number of participants in the meeting.

All I had to do was to search the web for a professional time saving tool to schedule a meeting, and one of the hits that I got was http://www.doodle.ch/

There you can Create an event, adjust the dates, and forward the link to the event to all your participants.

Then you can follow online what the participants vote for.

A key feature of this tool is that it has a time zone support.

Give it a try and I guess you will like it too.