Angus Council has confirmed the timing of the closure of part-time libraries at Edzell, Friockheim, Letham and Newtyle.
The local authority also revealed a near two-week hiatus for users before alternative mobile arrangements come into effect.
The closures were voted through as part of cost-cutting measures within the local authority’s budget-setting process for the year, but have been bitterly opposed within the communities.
The council’s neighbourhood services convener said the changes were a “necessary part of managing and maintaining important community services.”
“Councils do not have bottomless pits of money, so we have had to make savings to balance the budget this year and inevitably some of these savings impact on community services,” said Councillor Jim Millar.
“However, in Angus we are changing services rather than cutting them altogether, as other Scottish councils have had to do.”
Mr Millar added, “Regardless of which party is in power after the UK election there will be cuts in public sector funding.
“This means we have to look at different, more cost-effective ways of running our services.
“Although libraries, halls and leisure facilities will always be subsidised…we have to be realistic about the level of subsidy we can afford.”
The council has confirmed that books from the libraries in Letham, Friockheim and Newtyle are being gifted to primary schools.
Discussions about the historic book collection at Edzell continue, the authority said.
The mobile provision that comes into operation from April 12 will ensure each villages has two hours’ library provision each week.
Edzell will be covered on Monday mornings and afternoons in successive weeks, with Newtyle served on Tuesday and Wednesday afternoons as part of the same mobile route.
Letham will be catered for on Mondays and Wednesdays, and Friockheim on Tuesdays and Wednesdays in successive weeks.