tustvold commented on code in PR #4323:
URL: https://github.com/apache/arrow-rs/pull/4323#discussion_r1211893203


##########
arrow-cast/src/cast.rs:
##########
@@ -1853,7 +1853,7 @@ pub fn cast_with_options(
                 if time_array.is_null(i) {
                     b.append_null();
                 } else {
-                    b.append_value((time_array.value(i) / from_size) as i32);
+                    b.append_value(f64::floor(time_array.value(i) as f64 / 
from_size as f64) as i32);

Review Comment:
   Perhaps we could use 
https://docs.rs/num/latest/num/trait.Integer.html#tymethod.div_floor or 
something?



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