1 files changed, 51 insertions, 0 deletions
diff --git a/challenge-347/sgreen/python/ch-1.py b/challenge-347/sgreen/python/ch-1.py
new file mode 100755
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+++ b/challenge-347/sgreen/python/ch-1.py
@@ -0,0 +1,51 @@
+#!/usr/bin/env python3
+
+import re
+import sys
+
+DAYS = [
+    "1st", "2nd", "3rd", "4th", "5th", "6th", "7th", "8th", "9th", "10th",
+    "11th", "12th", "13th", "14th", "15th", "16th", "17th", "18th", "19th",
+    "20th", "21st", "22nd", "23rd", "24th", "25th", "26th", "27th", "28th",
+    "29th", "30th", "31st"
+]
+
+MONTHS = [
+    "Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct",
+    "Nov", "Dec"
+]
+
+YEARS = list(map(str, range(1900, 2101)))
+
+
+def format_date(input_string: str) -> str:
+    fields = [
+        ("day of month", DAYS, 1),
+        ("month", MONTHS, 1),
+        ("year", YEARS, 1900)
+    ]
+
+    input_list = input_string.split()
+    output_list = []
+
+    if len(input_list) != 3:
+        raise ValueError("Input must contain day, month, and year")
+
+    for i in (range(3)):
+        name, values, offset = fields[i]
+        value = input_list[i]
+        if value not in values:
+            raise ValueError(f"Invalid {name}: {value}")
+        index = values.index(value) + offset
+        output_list.append(f"{index:02d}")
+
+    return "-".join(reversed(output_list))
+
+
+def main():
+    result = format_date(sys.argv[1])
+    print(result)
+
+
+if __name__ == '__main__':
+    main()