diff --git a/workdays.py b/workdays.py
new file mode 100644
index 0000000..cb0e71d
--- /dev/null
+++ b/workdays.py
@@ -0,0 +1,63 @@
+import datetime as dt
+
+holidays = [
+    "2017-01-01", "2017-05-29", "2017-07-04", "2017-09-04", "2017-11-24",
+    "2017-11-25", "2017-12-25",
+    "2018-01-01", "2018-05-28", "2018-07-04", "2018-09-03", "2018-11-22",
+    "2018-11-23", "2018-12-25",
+    "2019-01-01", "2019-05-27", "2019-07-04", "2019-09-02", "2019-11-28",
+    "2019-11-29", "2019-12-25",
+    "2020-01-01", "2020-05-25", "2020-07-03", "2020-09-07", "2020-11-26",
+    "2020-11-27", "2020-12-25",
+    "2020-12-31", "2021-05-31", "2021-07-05", "2021-09-06", "2021-11-25",
+    "2021-11-26", "2021-12-25",
+    "2021-12-31", "2022-05-30", "2022-07-04", "2022-09-05", "2022-11-24",
+    "2022-11-25", "2022-12-24",
+    "2023-01-02", "2023-05-29", "2023-07-04", "2023-09-04", "2023-11-22",
+    "2023-11-23", "2023-12-26",
+    "2024-01-01", "2024-05-27", "2024-07-04", "2024-09-02", "2024-11-28",
+    "2024-11-29", "2024-12-25",
+    "2025-01-01", "2025-05-26", "2025-07-04", "2025-09-01", "2025-11-27",
+    "2025-11-28", "2025-12-25",
+]
+
+
+def is_holiday(day):
+    return day.strftime('%Y-%m-%d') in holidays
+
+
+def is_workday(day):
+    return (not is_holiday(day)) and day.weekday() < 5
+
+
+def not_workday(day):
+    return is_holiday(day) or day.weekday() > 4
+
+
+def start_day(day):
+    start = day
+    while True:
+        start -= dt.timedelta(days=1)
+        if is_workday(start) or start.weekday() == 5:
+            start += dt.timedelta(days=1)
+            return start
+
+
+def end_day(day):
+    start = day
+    while True:
+        start += dt.timedelta(days=1)
+        if is_workday(start) or start.weekday() == 6:
+            start -= dt.timedelta(days=1)
+            return start
+
+
+def get_date_range(date=''):
+    if date == '':
+        today = dt.datetime.now().date()
+    else:
+        today = dt.datetime.strptime(date, '%Y-%m-%d').date()
+    return [start_day(today), end_day(today)]
+
+if __name__ == "__main__":
+    pass