Will WinCC OA work past the year 2038?

Yes.

• We are working on the transition to full 64-bit.
• WinCC OA V3.19 is the first version to be 2038 ready.
• Release date of V3.19 was December 2022.

Please keep in mind, that only the current and 2 past versions of WinCC OA are under full support, so eventually you should upgrade projects which have a lifetime expectancy beyond 2038.