contemporary -
occurring in the same period of time; "a rise in interest rates is often contemporaneous with an increase in inflation"; "the composer Salieri was contemporary with Mozart"
synchronal,
synchronous,
synchronic occurring or existing at the same time or having the same period or phase; "recovery was synchronous with therapy"- Jour.A.M.A.; "a synchronous set of clocks"; "the synchronous action of a bird's wings in flight"; "synchronous oscillations"