He didn't mention the significance of the date. There was no need to.
By making time for severely ill youngsters on the 14th anniversary of his beloved mother's death, Prince Harry showed that on this day more than any other he hopes to make her proud.
Just as Diana did so often when she took her boys to meet the sick or needy, her son crouched down, holding the hand of a severely disabled child while chatting to her little sister about the challenges of caring for her.
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Molly, eight, is unable to speak, swallow or move much of her body since suffering a stroke and brain haemorrhage two years ago.
Since she became ill, her sister Daisy, six, has been singing her songs and arranged a rota of friends to keep her company.
Daisy's efforts earned her a prize for most caring child, presented by the Queen's grandson in his capacity as patron of WellChild, which supports youngsters like Molly.
The little girls wore matching pink dresses and tiaras for their date with royalty – prompting him to compliment their mother Katie on how "beautiful" they were.
Of the Prince, she said: "He was great. We talked about how the big sister, little sister roles had changed around, and how it was unusual and how inspirational Daisy is."
Harry also presented the "best brave child" prizes to Harley Lane, six, and Sophie Cooper, five.
Harley, from Stockport, had to have his arms and legs amputated after being infected with life-threatening meningococcal septicaemia, aged four.
Sophie, from Lincoln, was born prematurely and suffers from cerebral palsy, a cause close to the late Princess' heart.
Diana was recognised with the 1995 United Cerebral Palsy Humanitarian Award for raising awareness about the condition.