diff --git a/aoc_puzzle_cache/day_1 b/aoc_puzzle_cache/day_01
similarity index 100%
rename from aoc_puzzle_cache/day_1
rename to aoc_puzzle_cache/day_01
diff --git a/aoc_puzzle_cache/day_2 b/aoc_puzzle_cache/day_02
similarity index 100%
rename from aoc_puzzle_cache/day_2
rename to aoc_puzzle_cache/day_02
diff --git a/aoc_puzzle_cache/day_3 b/aoc_puzzle_cache/day_03
similarity index 100%
rename from aoc_puzzle_cache/day_3
rename to aoc_puzzle_cache/day_03
diff --git a/aoc_puzzle_cache/day_4 b/aoc_puzzle_cache/day_04
similarity index 100%
rename from aoc_puzzle_cache/day_4
rename to aoc_puzzle_cache/day_04
diff --git a/aoc_puzzle_cache/day_5 b/aoc_puzzle_cache/day_05
similarity index 100%
rename from aoc_puzzle_cache/day_5
rename to aoc_puzzle_cache/day_05
diff --git a/aoc_puzzle_cache/day_6 b/aoc_puzzle_cache/day_06
similarity index 100%
rename from aoc_puzzle_cache/day_6
rename to aoc_puzzle_cache/day_06
diff --git a/aoc_puzzle_cache/day_7 b/aoc_puzzle_cache/day_07
similarity index 100%
rename from aoc_puzzle_cache/day_7
rename to aoc_puzzle_cache/day_07
diff --git a/aoc_puzzle_cache/day_8 b/aoc_puzzle_cache/day_08
similarity index 100%
rename from aoc_puzzle_cache/day_8
rename to aoc_puzzle_cache/day_08
diff --git a/aoc_puzzle_cache/day_9 b/aoc_puzzle_cache/day_09
similarity index 100%
rename from aoc_puzzle_cache/day_9
rename to aoc_puzzle_cache/day_09
diff --git a/src/bin/day1.rs b/src/bin/day01.rs
similarity index 100%
rename from src/bin/day1.rs
rename to src/bin/day01.rs
diff --git a/src/bin/day1_revised.rs b/src/bin/day01_revised.rs
similarity index 100%
rename from src/bin/day1_revised.rs
rename to src/bin/day01_revised.rs
diff --git a/src/bin/day2.rs b/src/bin/day02.rs
similarity index 100%
rename from src/bin/day2.rs
rename to src/bin/day02.rs
diff --git a/src/bin/day3.rs b/src/bin/day03.rs
similarity index 100%
rename from src/bin/day3.rs
rename to src/bin/day03.rs
diff --git a/src/bin/day4.rs b/src/bin/day04.rs
similarity index 100%
rename from src/bin/day4.rs
rename to src/bin/day04.rs
diff --git a/src/bin/day5.rs b/src/bin/day05.rs
similarity index 100%
rename from src/bin/day5.rs
rename to src/bin/day05.rs
diff --git a/src/bin/day6.rs b/src/bin/day06.rs
similarity index 100%
rename from src/bin/day6.rs
rename to src/bin/day06.rs
diff --git a/src/bin/day8.rs b/src/bin/day08.rs
similarity index 100%
rename from src/bin/day8.rs
rename to src/bin/day08.rs
diff --git a/src/bin/day9.rs b/src/bin/day09.rs
similarity index 100%
rename from src/bin/day9.rs
rename to src/bin/day09.rs
diff --git a/src/utils/aoc.rs b/src/utils/aoc.rs
index b2fdad1..24692e5 100644
--- a/src/utils/aoc.rs
+++ b/src/utils/aoc.rs
@@ -12,7 +12,7 @@ use std::path::PathBuf;
 static AOC_PUZZLE_INPUT_CACHE: &str = "aoc_puzzle_cache";
 
 pub async fn get_puzzle_input(day: u8) -> Result<String> {
-    let file_name = format!("day_{}", day);
+    let file_name = format!("day_{:02}", day);
     let cache_path = PathBuf::from(AOC_PUZZLE_INPUT_CACHE).join(file_name);
     if cache_path.exists() {
         // Read from the cache file