facet_plot dates not displaying correctly

[ShelleyPeterson]

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I'm aligning a tree to a set of data points to show relationship over time. My data set has sample number in the first column (corresponding to tree) and date in the second column (as.Date = TRUE). In the plot, the date is displayed as a number rather than date. Is there a way to adjust the contents of the X axis? I've tried adding "scale_x_date" in a variety of places and it just gave me errors.

`tree <- ggtree(phylo) + geom_tiplab()
d <- data.frame(label = dd$Number,
                value = dd$Date.Collected)
p2 <- facet_plot(tree, panel = "Date Collected",
                 data = d,
                 geom = geom_point,
                 mapping = aes(x = value))+

      theme_bw()

plot(p2)`

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[GuangchuangYu]

reproducible example pls.