diff --git a/public/js/clock.js b/public/js/clock.js
index c97c7fbb..89f84e73 100755
--- a/public/js/clock.js
+++ b/public/js/clock.js
@@ -234,7 +234,14 @@ function get_period_name(default_name, day_of_week) {
     }
     // period_names has class names now
     for (const { name, period } of period_names[bs_day]) {
-        if (period.slice(-1) === default_name.slice(-1))
+        if (period === default_name)
+            return name;
+        // "BLOCK 1", "BLOCK 2", etc.
+        if (period === `BLOCK ${default_name.slice(-1)}`)
+            return name;
+        // For periods 1, 2, 3, 4 stored as strings containing "01", etc.
+        let match;
+        if ((match = period.match(/0\d/)) && default_name.includes(match[0]))
             return name;
     }
     return default_name;