I have a REST URL to get all users formatted like this: http://example.com/users
To get an individual user by id: http://example.com/users/12345
To g
if example.com/users/12345 gets the user with id 12345, then to get all users by id it should be example.com/users with the id included in the response as a relationship. (usually a hyperlink to that resource).
Now to get them by date ranges it should be example.com/users/start=01-01-2012&end=01-31-2012
The 12345 part is the id of an individual user, it's a resource, therefore it should not be included to get the rest of the users.
As the name of the parameter it should be meaningful. start could mean anything, but start_date is more meaninful.