The Warriors, though, were forced to abandon their plans to sign Calderon when Kevin Durant suffered an MCL sprain and a bone bruise in his left knee on Tuesday night in Washington. Golden State in turn signed Matt Barnes to fill in for Durant.
Golden State went ahead with the signing of Calderon on Wednesday, living up to its promise, but it waived the 35-year-old two hours later to ensure that Calderon would retain playoff eligibility with his next team.
NBA rules dictate that players must be waived by March 1 to remain playoff-eligible with their next team.
By claiming Calderon off waivers by 5 p.m. Saturday, the Hawks absorbed the roughly $400,000 that Golden State would have owed him for the balance of the season.
"We feel fortunate to be able to add a player of Jose's caliber at this point in the season," Hawks coach Mike Budenholzer said. "His unselfish nature and ability to shoot with range fits our style of play, and his experience will add to our locker room."
Calderon is averaging 3.3 points and 2.1 assists this season. He will wear No. 13 for Atlanta.
Information from ESPN's Marc Stein was used in this report.