Zelda, 26, took to social media to honour her beloved father with an intimate family photo.
The sweet snapshot was accompanied by a heartbreaking message, as the actress vowed to continue his legacy in helping the charities that were closest to his heart.
“Still not really sure what to do on days like today… I know I can’t give you a present anymore, but I guess that means I’ll just have to keep giving them in your name instead,” she wrote.
Zelda has been getting much more involved in charity work since her father passed as a way to channel Robin’s generous spirit.
She took his birthday as an opportunity to speak about the work she’s done.
“This year, I tried to help three causes you cared about in one; rescue dogs, people suffering from disabilities, and our nation’s wounded veterans, so I donated to freedomservicedogs.org,” she explained in the message aimed at her actor father.
Zelda talks about the heartache of losing her father in the video below. Post continues.
“They rescue pups from shelters and train them so that they can be paired with someone in dire need of their help and companionship,” she explained.
“Thought you’d get a kick out of furry, four legged friends helping change the world, one warrior in need at a time,” she penned.
“Happy birthday Poppo. Shasha, Zakky, Codeman and I all love you and miss you like crazy. Xo.”
She shared the heart-felt message alongside a gorgeous throwback family photo featuring Zelda and her siblings, Zachary and Cody, all hanging off the funnyman actor.
Relive the magic that was Robin Williams through his best film scenes below.
This story originally appeared on Woman’s Day Australia