diff --git a/templates/planning.html b/templates/planning.html
index e27816d..022b235 100644
--- a/templates/planning.html
+++ b/templates/planning.html
@@ -48,14 +48,48 @@
 
     <label class="grid gap-2">
       <span class="text-sm font-semibold text-slate-700">Timezone</span>
-      <input
-        type="text"
+      <select
         name="timezone"
-        value="{{ page.timezone_value }}"
-        placeholder="UTC, -08:00, +05:30"
         required
         class="rounded-lg border border-slate-300 bg-white px-3 py-2 text-sm text-slate-900 focus:border-teal-500 focus:outline-none"
-      />
+      >
+        <option value="UTC" {% if page.timezone_value == "UTC" %}selected{% endif %}>UTC</option>
+        <option value="-12:00" {% if page.timezone_value == "-12:00" %}selected{% endif %}>(UTC-12:00) Baker Island</option>
+        <option value="-11:00" {% if page.timezone_value == "-11:00" %}selected{% endif %}>(UTC-11:00) American Samoa</option>
+        <option value="-10:00" {% if page.timezone_value == "-10:00" %}selected{% endif %}>(UTC-10:00) Hawaii</option>
+        <option value="-09:00" {% if page.timezone_value == "-09:00" %}selected{% endif %}>(UTC-09:00) Alaska</option>
+        <option value="-08:00" {% if page.timezone_value == "-08:00" %}selected{% endif %}>(UTC-08:00) Pacific Time</option>
+        <option value="-07:00" {% if page.timezone_value == "-07:00" %}selected{% endif %}>(UTC-07:00) Mountain Time</option>
+        <option value="-06:00" {% if page.timezone_value == "-06:00" %}selected{% endif %}>(UTC-06:00) Central Time</option>
+        <option value="-05:00" {% if page.timezone_value == "-05:00" %}selected{% endif %}>(UTC-05:00) Eastern Time</option>
+        <option value="-04:00" {% if page.timezone_value == "-04:00" %}selected{% endif %}>(UTC-04:00) Atlantic Time</option>
+        <option value="-03:30" {% if page.timezone_value == "-03:30" %}selected{% endif %}>(UTC-03:30) Newfoundland</option>
+        <option value="-03:00" {% if page.timezone_value == "-03:00" %}selected{% endif %}>(UTC-03:00) Buenos Aires</option>
+        <option value="-02:00" {% if page.timezone_value == "-02:00" %}selected{% endif %}>(UTC-02:00) South Georgia</option>
+        <option value="-01:00" {% if page.timezone_value == "-01:00" %}selected{% endif %}>(UTC-01:00) Azores</option>
+        <option value="+00:00" {% if page.timezone_value == "+00:00" %}selected{% endif %}>(UTC+00:00) London / Dublin</option>
+        <option value="+01:00" {% if page.timezone_value == "+01:00" %}selected{% endif %}>(UTC+01:00) Central Europe</option>
+        <option value="+02:00" {% if page.timezone_value == "+02:00" %}selected{% endif %}>(UTC+02:00) Eastern Europe</option>
+        <option value="+03:00" {% if page.timezone_value == "+03:00" %}selected{% endif %}>(UTC+03:00) Moscow</option>
+        <option value="+03:30" {% if page.timezone_value == "+03:30" %}selected{% endif %}>(UTC+03:30) Tehran</option>
+        <option value="+04:00" {% if page.timezone_value == "+04:00" %}selected{% endif %}>(UTC+04:00) Dubai</option>
+        <option value="+04:30" {% if page.timezone_value == "+04:30" %}selected{% endif %}>(UTC+04:30) Kabul</option>
+        <option value="+05:00" {% if page.timezone_value == "+05:00" %}selected{% endif %}>(UTC+05:00) Karachi</option>
+        <option value="+05:30" {% if page.timezone_value == "+05:30" %}selected{% endif %}>(UTC+05:30) India</option>
+        <option value="+05:45" {% if page.timezone_value == "+05:45" %}selected{% endif %}>(UTC+05:45) Nepal</option>
+        <option value="+06:00" {% if page.timezone_value == "+06:00" %}selected{% endif %}>(UTC+06:00) Dhaka</option>
+        <option value="+06:30" {% if page.timezone_value == "+06:30" %}selected{% endif %}>(UTC+06:30) Myanmar</option>
+        <option value="+07:00" {% if page.timezone_value == "+07:00" %}selected{% endif %}>(UTC+07:00) Bangkok</option>
+        <option value="+08:00" {% if page.timezone_value == "+08:00" %}selected{% endif %}>(UTC+08:00) Singapore / Beijing</option>
+        <option value="+09:00" {% if page.timezone_value == "+09:00" %}selected{% endif %}>(UTC+09:00) Tokyo / Seoul</option>
+        <option value="+09:30" {% if page.timezone_value == "+09:30" %}selected{% endif %}>(UTC+09:30) Adelaide</option>
+        <option value="+10:00" {% if page.timezone_value == "+10:00" %}selected{% endif %}>(UTC+10:00) Sydney</option>
+        <option value="+11:00" {% if page.timezone_value == "+11:00" %}selected{% endif %}>(UTC+11:00) Solomon Islands</option>
+        <option value="+12:00" {% if page.timezone_value == "+12:00" %}selected{% endif %}>(UTC+12:00) Auckland</option>
+        <option value="+12:45" {% if page.timezone_value == "+12:45" %}selected{% endif %}>(UTC+12:45) Chatham Islands</option>
+        <option value="+13:00" {% if page.timezone_value == "+13:00" %}selected{% endif %}>(UTC+13:00) Samoa</option>
+        <option value="+14:00" {% if page.timezone_value == "+14:00" %}selected{% endif %}>(UTC+14:00) Line Islands</option>
+      </select>
       <span class="text-xs text-slate-500">Used to determine when "today" starts for your account.</span>
     </label>
 
diff --git a/templates/signup.html b/templates/signup.html
index fe94db5..8f5d796 100644
--- a/templates/signup.html
+++ b/templates/signup.html
@@ -15,14 +15,48 @@
   <form method="post" action="/signup" class="mt-4 grid gap-3">
     <input type="text" name="username" placeholder="Username" required class="rounded-lg border border-slate-300 px-3 py-2 text-sm" />
     <input type="password" name="password" placeholder="Password (min 4 chars)" required minlength="4" class="rounded-lg border border-slate-300 px-3 py-2 text-sm" />
-    <input
-      type="text"
+    <select
       name="timezone"
-      value="{{ page.timezone_value }}"
-      placeholder="Timezone (UTC, -08:00, +05:30)"
       required
       class="rounded-lg border border-slate-300 px-3 py-2 text-sm"
-    />
+    >
+      <option value="UTC" {% if page.timezone_value == "UTC" %}selected{% endif %}>UTC</option>
+      <option value="-12:00" {% if page.timezone_value == "-12:00" %}selected{% endif %}>(UTC-12:00) Baker Island</option>
+      <option value="-11:00" {% if page.timezone_value == "-11:00" %}selected{% endif %}>(UTC-11:00) American Samoa</option>
+      <option value="-10:00" {% if page.timezone_value == "-10:00" %}selected{% endif %}>(UTC-10:00) Hawaii</option>
+      <option value="-09:00" {% if page.timezone_value == "-09:00" %}selected{% endif %}>(UTC-09:00) Alaska</option>
+      <option value="-08:00" {% if page.timezone_value == "-08:00" %}selected{% endif %}>(UTC-08:00) Pacific Time</option>
+      <option value="-07:00" {% if page.timezone_value == "-07:00" %}selected{% endif %}>(UTC-07:00) Mountain Time</option>
+      <option value="-06:00" {% if page.timezone_value == "-06:00" %}selected{% endif %}>(UTC-06:00) Central Time</option>
+      <option value="-05:00" {% if page.timezone_value == "-05:00" %}selected{% endif %}>(UTC-05:00) Eastern Time</option>
+      <option value="-04:00" {% if page.timezone_value == "-04:00" %}selected{% endif %}>(UTC-04:00) Atlantic Time</option>
+      <option value="-03:30" {% if page.timezone_value == "-03:30" %}selected{% endif %}>(UTC-03:30) Newfoundland</option>
+      <option value="-03:00" {% if page.timezone_value == "-03:00" %}selected{% endif %}>(UTC-03:00) Buenos Aires</option>
+      <option value="-02:00" {% if page.timezone_value == "-02:00" %}selected{% endif %}>(UTC-02:00) South Georgia</option>
+      <option value="-01:00" {% if page.timezone_value == "-01:00" %}selected{% endif %}>(UTC-01:00) Azores</option>
+      <option value="+00:00" {% if page.timezone_value == "+00:00" %}selected{% endif %}>(UTC+00:00) London / Dublin</option>
+      <option value="+01:00" {% if page.timezone_value == "+01:00" %}selected{% endif %}>(UTC+01:00) Central Europe</option>
+      <option value="+02:00" {% if page.timezone_value == "+02:00" %}selected{% endif %}>(UTC+02:00) Eastern Europe</option>
+      <option value="+03:00" {% if page.timezone_value == "+03:00" %}selected{% endif %}>(UTC+03:00) Moscow</option>
+      <option value="+03:30" {% if page.timezone_value == "+03:30" %}selected{% endif %}>(UTC+03:30) Tehran</option>
+      <option value="+04:00" {% if page.timezone_value == "+04:00" %}selected{% endif %}>(UTC+04:00) Dubai</option>
+      <option value="+04:30" {% if page.timezone_value == "+04:30" %}selected{% endif %}>(UTC+04:30) Kabul</option>
+      <option value="+05:00" {% if page.timezone_value == "+05:00" %}selected{% endif %}>(UTC+05:00) Karachi</option>
+      <option value="+05:30" {% if page.timezone_value == "+05:30" %}selected{% endif %}>(UTC+05:30) India</option>
+      <option value="+05:45" {% if page.timezone_value == "+05:45" %}selected{% endif %}>(UTC+05:45) Nepal</option>
+      <option value="+06:00" {% if page.timezone_value == "+06:00" %}selected{% endif %}>(UTC+06:00) Dhaka</option>
+      <option value="+06:30" {% if page.timezone_value == "+06:30" %}selected{% endif %}>(UTC+06:30) Myanmar</option>
+      <option value="+07:00" {% if page.timezone_value == "+07:00" %}selected{% endif %}>(UTC+07:00) Bangkok</option>
+      <option value="+08:00" {% if page.timezone_value == "+08:00" %}selected{% endif %}>(UTC+08:00) Singapore / Beijing</option>
+      <option value="+09:00" {% if page.timezone_value == "+09:00" %}selected{% endif %}>(UTC+09:00) Tokyo / Seoul</option>
+      <option value="+09:30" {% if page.timezone_value == "+09:30" %}selected{% endif %}>(UTC+09:30) Adelaide</option>
+      <option value="+10:00" {% if page.timezone_value == "+10:00" %}selected{% endif %}>(UTC+10:00) Sydney</option>
+      <option value="+11:00" {% if page.timezone_value == "+11:00" %}selected{% endif %}>(UTC+11:00) Solomon Islands</option>
+      <option value="+12:00" {% if page.timezone_value == "+12:00" %}selected{% endif %}>(UTC+12:00) Auckland</option>
+      <option value="+12:45" {% if page.timezone_value == "+12:45" %}selected{% endif %}>(UTC+12:45) Chatham Islands</option>
+      <option value="+13:00" {% if page.timezone_value == "+13:00" %}selected{% endif %}>(UTC+13:00) Samoa</option>
+      <option value="+14:00" {% if page.timezone_value == "+14:00" %}selected{% endif %}>(UTC+14:00) Line Islands</option>
+    </select>
     <button type="submit" class="rounded-lg bg-slate-900 px-4 py-2 text-sm font-semibold text-white hover:bg-slate-700" {% if !page.allow_signup %}disabled{% endif %}>Sign Up</button>
   </form>
   <p class="mt-3 text-sm text-slate-600">Already have an account? <a class="font-semibold text-slate-900 underline" href="/login">Sign in</a></p>