I’m having a weird problem with my heat map. It looks great, except for the x-axis. It only marks the years from 1900 onward, leaving the preceding ticks with a strange “:00” text. I can’t, for the life of me, figure out what I’ve done wrong in this instance
Here’s a link to the project on Codepen (not a fan of Codepen, but there we are). Any feedback on my code would be greatly appreciated.