diff --git a/rendercv/data/models/computers.py b/rendercv/data/models/computers.py
index b45a3816..16fc2bfb 100644
--- a/rendercv/data/models/computers.py
+++ b/rendercv/data/models/computers.py
@@ -195,11 +195,11 @@ def compute_time_span_string(
 
         # Calculate the number of years and months between start_date and end_date:
         how_many_years = timespan_in_days // 365
-        how_many_months = round((timespan_in_days % 365) / 30)
+        how_many_months = (timespan_in_days % 365) // 30 + 1
         # Deal with overflow (prevent rounding to 1 year 12 months, etc.)
         how_many_years += how_many_months // 12
         how_many_months %= 12
-        
+
         # Format the number of years and months between start_date and end_date:
         if how_many_years == 0:
             how_many_years_string = None
@@ -209,7 +209,9 @@ def compute_time_span_string(
             how_many_years_string = f"{how_many_years} {LOCALE_CATALOG['years']}"
 
         # Format the number of months between start_date and end_date:
-        if how_many_months == 1 or (how_many_years_string is None and how_many_months == 0):
+        if how_many_months == 1 or (
+            how_many_years_string is None and how_many_months == 0
+        ):
             how_many_months_string = f"1 {LOCALE_CATALOG['month']}"
         elif how_many_months == 0:
             how_many_months_string = None
diff --git a/tests/test_data.py b/tests/test_data.py
index c5740d71..bb5e5fce 100644
--- a/tests/test_data.py
+++ b/tests/test_data.py
@@ -184,6 +184,22 @@ def test_if_the_schema_is_the_latest(root_directory_path):
             "2020 – 2021",
             "1 year 1 month",
         ),
+        (
+            "2020-01-01",
+            "2022-01-01",
+            None,
+            "Jan 2020 – Jan 2022",
+            "2020 – 2022",
+            "2 years 1 month",
+        ),
+        (
+            "2020-01-01",
+            "2021-12-10",
+            None,
+            "Jan 2020 – Dec 2021",
+            "2020 – 2021",
+            "2 years",
+        ),
         (
             Date(2020, 1, 1),
             Date(2021, 1, 1),
@@ -230,7 +246,7 @@ def test_if_the_schema_is_the_latest(root_directory_path):
             None,
             "Feb 2020 – present",
             "2020 – present",
-            "3 years 11 months",
+            "4 years",
         ),
         ("2020-01-01", "2021-01-01", "2023-02-01", "Feb 2023", "2023", ""),
         ("2020", "2021", None, "2020 – 2021", "2020 – 2021", "1 year"),