The move to change to TT, or terrestrial time, is one of 86 motions to be debated at the party's state conference in Devonport this weekend.

It comes as Tasmanians prepare to put their clocks forward an hour for daylight saving starting on Sunday.

Business has rejected changing the time as a "nightmare".

The New Town/North Hobart Liberal branch argues that there is too little afternoon daylight during winter.

"We seek to move Tasmania such that more daylight is in the late afternoon rather than the early morning," it said.

"Australian Eastern Standard Time is set for [in the main] Sydney and Melbourne, which are both either significantly to the North or West of Tasmania [Melbourne CBD actually sits at 144.91 E, Stanley at 145.12].

"This means that the settings for AEST are not ideal for Tasmania. In the past, it has also been more convenient given the agrarian/primary production focus of the state to emphasis early morning light over late afternoon, but this has now changed."

Tasmanian Chamber of Commerce and Industry chief executive Michael Bailey said alignment of time zones was important for "ease of business across the nation".

"Such a move would be a nightmare for business to manage," he said.

Delegates will debate motions on topics including pill testing, abortion, relocating public servants to regional areas, nuclear power, reducing credit card interest rates, voting changes and keeping cows out of creeks.

A motion supporting the appointment of former Prime Minister Tony Abbott as ambassador to the Holy See is also on the agenda.

Constitutional and organisational motions will be discussed behind closed doors at the conference.

The motion opposing pill testing at events and festivals says drugs such as "ecstasy and ice are illegal for a reason"."

"They are illicit drugs because they can kill. The government should not be making any move to condone the taking of such drugs by providing testing facilities," the Lindisfarne branch said.

Another branch wants the government to reject any expansion of the Aboriginal and dual naming policy.