deadline_after - Convert a time relative to now to an absolute deadline
#include <zircon/syscalls.h>
zx_time_t zx_deadline_after(zx_duration_t nanoseconds)
zx_deadline_after() is a utility for converting from now-relative durations to absolute deadlines.
zx_deadline_after() returns the absolute time (with respect to CLOCK_MONOTONIC) that is nanoseconds nanoseconds from now.
zx_deadline_after() does not report any error conditions.
// Sleep 50 milliseconds
zx_time_t deadline = zx_deadline_after(ZX_MSEC(50));
zx_nanosleep(deadline);