Ensure two `SystemTime`s are equal when nanos add to exactly 1B

Currently if you add a duration which should lead to 0 nanos and 1
additional second, we end up with no additional seconds, and 1000000000
nanos.

1 files changed, 1 insertions, 1 deletions

diff --git a/src/libstd/sys/unix/time.rs b/src/libstd/sys/unix/time.rs
index 75319ce962c..cc026b8fd10 100644
--- a/src/libstd/sys/unix/time.rs
+++ b/src/libstd/sys/unix/time.rs
@@ -330,7 +330,7 @@ mod inner {
             // Nano calculations can't overflow because nanos are <1B which fit
             // in a u32.
             let mut nsec = other.subsec_nanos() + self.t.tv_nsec as u32;
-            if nsec > NSEC_PER_SEC as u32 {
+            if nsec >= NSEC_PER_SEC as u32 {
                 nsec -= NSEC_PER_SEC as u32;
                 secs = secs.checked_add(1).expect("overflow when adding \
                                                    duration to time");