diff --git a/dzgui/model/proxy_model.py b/dzgui/model/proxy_model.py
index 997a59f..dec8338 100644
--- a/dzgui/model/proxy_model.py
+++ b/dzgui/model/proxy_model.py
@@ -12,6 +12,9 @@ if TYPE_CHECKING:
     from dzgui.api.servers import Record
     from dzgui.model.servers import NewPlayerCount
 
+DAY_REG = r"([0][7-9]|[1][0-6])"
+NIGHT_REG = r"([0][0-6]|[1][7-9]|[2][0-3])"
+
 
 class ProxyModelManager:
     """
@@ -231,11 +234,9 @@ class ProxyModelManager:
                         final.append(row)
                 rows = final
             case strings.filter_day:
-                reg = r"([0][7-9]|[1][0-6])"
-                rows = [row for row in rows if not re.match(reg, row[3])]
+                rows = [row for row in rows if not re.match(DAY_REG, row[3])]
             case strings.filter_night:
-                reg = r"([0][0-6]|[1][7-9]|[2][0-3])"
-                rows = [row for row in rows if not re.match(reg, row[3])]
+                rows = [row for row in rows if not re.match(NIGHT_REG, row[3])]
             case strings.filter_nonascii:
                 rows = [row for row in rows if row[0].isascii()]
             case strings.filter_lowpop:
diff --git a/tests/test_time.py b/tests/test_time.py
index 65257b3..210068a 100644
--- a/tests/test_time.py
+++ b/tests/test_time.py
@@ -1,7 +1,7 @@
 import re
 
-day = r"([0][7-9]|[1][0-6])"
-night = r"([0][0-6]|[1][7-9]|[2][0-3])"
+from dzgui.model.proxy_model import DAY_REG, NIGHT_REG
+
 
 def iterate(h: str, r: str) -> None:
     for m in range(60):
@@ -13,11 +13,11 @@ def test_day() -> None:
     for h in range(17):
         if h < 7:
             continue
-        iterate(h, day)
+        iterate(h, DAY_REG)
 
 
 def test_night() -> None:
     for h in range(24):
         if 6 < h < 17:
             continue
-        iterate(h, night)
+        iterate(h, NIGHT_REG)