Neil Patrick Harris and David Burtka celebrate 20 years together

The How I Met Your Mother star took to Instagram to share the couple's 20-year love story. "Our first date was 20 years ago today. Man, how time has flown by... and yet... we've shared so many adventures, created so many remarkable memories," wrote Harris. "If the next 7,300 days are like the previous ones, I'll be absolutely thrilled. Happy anniversary, David. I love you unconditionally, most of the time. XO," he quipped. The charming message was accompanied by a recent picture of him and Burtka, side by side.