Dating ancestors in phylogenetic trees in R.
Jones, Bradley R; Poon, Art FY. node.dating: dating ancestors in phylogenetic trees in R. Bioinformatics (2017) 33 (6): 932-934. doi: 10.1093/bioinformatics/btw744.
This software is now a part of ape package available at cran.r-project.org. See COPYING in that package for licensing issues.