diff --git a/src/Regridder.jl b/src/Regridder.jl
index 18ee558b1..1c6dcbc10 100644
--- a/src/Regridder.jl
+++ b/src/Regridder.jl
@@ -645,24 +645,38 @@ function truncate_dataset(date0, time_start, time_end, datafile, datapath)
     ds = NCDataset(datafile, "r")
     dates = ds["time"][:]
 
-    if date_start < dates[1]        # if the simulation start date is before our first date in the dataset, we leave the beginning of the truncated dataset to be the first date available
+    # if the simulation start date is before our first date in the dataset
+    # leave the beginning of the truncated dataset to be first date available
+    if date_start < dates[1]
         start_id = 1
-    elseif date_start > last(dates)     # if the simulation start date is after the last date in the dataset, we start the truncated dataset at its last possible date
+        # if the simulation start date is after the last date in the dataset
+        # start the truncated dataset at its last possible date
+    elseif date_start > last(dates)
         start_id = length(dates)
-    else                                # if the simulation start date falls within the range of the dataset, we find the closest date to the start date and truncate there 
+        # if the simulation start date falls within the range of the dataset
+        # find the closest date to the start date and truncate there 
+    else
         (~, start_id) = findmin(x -> abs(x - date_start), dates)
-        if dates[start_id] > date_start     # if the closest date is after the start date, we add one more date before it to the dataset 
+        # if the closest date is after the start date, add one more date before 
+        if dates[start_id] > date_start
             start_id = start_id - 1
         end
     end
 
-    if date_end < dates[1]              # if the simulation end date is before our first date in the dataset, we truncate the end of the dataset to be the first date
+    # if the simulation end date is before our first date in the dataset
+    # truncate the end of the dataset to be the first date
+    if date_end < dates[1]
         end_id = 1
-    elseif date_end > last(dates)       # if the simulation end date is after the last date in the dataset, we leave the end of the dataset as is 
+        # if the simulation end date is after the last date in the dataset
+        # leave the end of the dataset as is 
+    elseif date_end > last(dates)
         end_id = length(dates)
-    else                                # if the simulation end date falls within the range of the dataset, we find the closest date to the end date and truncate there 
+        # if the simulation end date falls within the range of the dataset
+        # find the closest date to the end date and truncate there 
+    else
         (~, end_id) = findmin(x -> abs(x - date_end), dates)
-        if dates[end_id] < date_end         # if the closest date is before the end date, we add one more date after it to the dataset 
+        # if the closest date is before the end date, add one more date after
+        if dates[end_id] < date_end
             end_id = end_id + 1
         end
     end
diff --git a/test/regridder_tests.jl b/test/regridder_tests.jl
index a6227f957..9e9548ef3 100644
--- a/test/regridder_tests.jl
+++ b/test/regridder_tests.jl
@@ -328,6 +328,12 @@ end
     # values for the truncations 
     time_start = 0.0
     time_end = 1.728e6
+    # tests five cases: 
+    # 1. both start and end are earlier than in datafile 
+    # 2. start is early, end is within datafine 
+    # 3. both start and end within datafile 
+    # 4. start is in datafile end is not 
+    # 5. both start and end are later than in datafile
     date0test = ["18690101", "18700101", "19790228", "20220301", "20230101"]
     for date in date0test
         date0 = DateTime(date, dateformat"yyyymmdd")
@@ -355,5 +361,8 @@ end
             @test last(new_dates) >= date_end
             @test new_dates[length(new_dates) - 1] <= date_end
         end
+        close(nds)
     end
+
+    close(ds)
 end