Public servants will observe two minutes of silence at 9.51am on Monday to remember those who lost their lives a week earlier in the Ashburton Work and Income shootings.
"Together we will mark the time this tragedy unfolded, show our respect for the greatly valued colleagues we have lost, and also show our support for everyone who has been affected by what happened in Ashburton," State Services Commissioner Iain Rennie said.
"I know this has been a difficult time for the staff at Work and Income and the wider Ministry of Social Development, as well as for other state servants around New Zealand."
Winz workers Peggy Noble, 67, and Leigh Cleveland, 55, died in Monday's shooting.
Lindy Louise Curtis, 43, was critically injured and is recovering in hospital.
"Two dedicated state servants and colleagues of us all, Peg Noble and Leigh Cleveland, lost their lives and Lindy Curtis was badly hurt.
"Between them, Peg and Leigh gave 33 years of service to the New Zealand public."
Mrs Noble's funeral will be held in Ashburton on Monday.
She will be farewelled at 11am at the Ashburton Trust Event Centre, followed by interment at the Ashburton New Lawn Cemetery.
The funeral for Ms Cleveland will be held in Alexandra at 2pm tomorrow.
A funeral notice for Ms Cleveland described her as a much loved daughter of Kathleen and the late Eric of Alexandra.
She was also a loved sister, aunt and great-aunt.
Her funeral service will be held in the District Club in Alexandra .
In lieu of flowers, her family has requested donations be made to the New Zealand Guide Dog Association.
Ms Cleveland's friends and family have described her a quiet-spoken woman who loved her dogs.
Survivor Lindy Curtis remains in Christchurch Hospital in a stable condition.
Her daughter told the organisers of a candlelight vigil in Ashburton, attended by about 300 people last night, that her mother was "doing very well".
Meanwhile, police are appealing to the public to help them locate a black mountain bike and any other items belonging to Russell John Tully, who has been charged with the murder of Mrs Noble and Ms Cleveland.
In particular, police are looking for an additional firearm and ammunition the alleged gunman may have had in his possession on Monday.
Officers were continuing a thorough search of the Ashburton River area and asked the public to continue to keep away from the area over the weekend.
A police spokeswoman said investigators had already located a blue, red and yellow mountain bike "along with a number of other items of interest to the enquiry".
Tully is believed to have been camping at sites along the Ashburton River in the days leading up to the incident and it is possible there are further items belonging to him in this area.
Anyone with information was asked to call Ashburton police urgently on (03) 307 8411.