He believed there had been sufficient information about the new law for the public about the changes.
"Auckland and Wellington shift commanders have both said the transition to the new hours had been quite smooth. In Wellington people came out of the bars at 4 o'clock, jumped into a taxi and went home - no issues.
"That's indicative of people understanding the hours are there and they are operating to those hours.''
He was "cautiously optimistic'' that police were on the right track.
"The bars in Auckland were packed last night, they were really busy and yet our calls for service, which is people calling up asking for help are slightly down on last week.''
"It's too early to say definitively, all I can say at first glance things are looking up.''
Changes to the new liquor laws include:
* off-licences must close by 11pm;
* on-licences must close at 4am;
* police officers will be able to issue alcohol infringement notices for a range of new offences, including breach of local alcohol bans, lending ID to an under-18-year-old, and presenting a fake ID ($250 per offence);
* bars that serve intoxicated people, or allow them to remain on the premises while intoxicated, risk a fine of up to $10,000; and
* police throughout NZ will use an "alcohol assessment tool" to assess whether a person is merely under the influence of alcohol or "intoxicated" as defined in the act.