diff --git a/src/heatmap.rs b/src/heatmap.rs
index 20a70b8..23ee9c9 100644
--- a/src/heatmap.rs
+++ b/src/heatmap.rs
@@ -52,6 +52,16 @@ impl Heatmap {
 		}
 
 		while current_day <= until {
+			if split_months {
+				// If current day is the first of the month we add 2 weeks worth of empty space so
+				// months are more visible
+				if current_day.day0() == 0 {
+					for i in 0..14 {
+						heatmap.data[(i as usize) % 7].push(-1);
+					}
+				}
+			}
+
 			let month_name = current_day.format("%b").to_string();
 
 			if current_day == since {
@@ -74,19 +84,6 @@ impl Heatmap {
 				None => heatmap.data[day_of_week as usize].push(0),
 			}
 
-			if split_months {
-				let last_day_of_month =
-					heatmap.last_day_of_month(current_day.year_ce().1 as i32, current_day.month());
-
-				// If current day is the last of the month we add 2 weeks worth of empty space so
-				// months are more visible
-				if last_day_of_month == current_day {
-					for i in 0..14 {
-						heatmap.data[(i as usize) % 7].push(-1);
-					}
-				}
-			}
-
 			current_day += Duration::days(1);
 			day_of_week = current_day.weekday().num_days_from_monday() % 7;
 		}
@@ -94,13 +91,6 @@ impl Heatmap {
 		heatmap
 	}
 
-	fn last_day_of_month(&self, year: i32, month: u32) -> NaiveDate {
-		NaiveDate::from_ymd_opt(year, month + 1, 1)
-			.unwrap_or_else(|| NaiveDate::from_ymd(year + 1, 1, 1))
-			.pred_opt()
-			.unwrap_or_default()
-	}
-
 	fn months_row(&self) -> String {
 		let mut row = "   ".to_string();