'Linux 5.1 continues the massive undertaking in preparing the kernel for the Year 2038 problem. Phoronix:

The Linux kernel has been seeing "Y2038" work for years and the effort is far from over. Thomas Gleixner (a Linux kernel developer who serves as a member of the technical advisory board at The Linux Foundation) sent in the latest Y2038 work for the Linux 5.1 kernel, which after a lot of ground work in previous kernels has introduced the first set of syscalls that are Year 2038 safe.'

-- source: https://linux.slashdot.org/story/19/03/05/1929233

Cheers, Peter