diff --git a/res/config.ini b/res/config.ini
index 02a242e..2522b40 100644
--- a/res/config.ini
+++ b/res/config.ini
@@ -48,7 +48,11 @@ bg = 0x00000000
 # none -> Disabled (default)
 # en   -> English
 # fa   -> Farsi
-bigclock = none
+bigclock = en
+# Set bigclock to 12-hour notation.
+bigclock_12hr = false 
+# Set bigclock to show the seconds.
+bigclock_seconds = false
 
 # Blank main box background
 # Setting to false will make it transparent
diff --git a/src/bigclock.zig b/src/bigclock.zig
index 4fae3a4..a1c860a 100644
--- a/src/bigclock.zig
+++ b/src/bigclock.zig
@@ -51,6 +51,9 @@ fn toBigNumber(char: u8, bigclock: Bigclock) [SIZE]u21 {
         '7' => locale_chars.SEVEN,
         '8' => locale_chars.EIGHT,
         '9' => locale_chars.NINE,
+        'p', 'P' => locale_chars.P,
+        'a', 'A' => locale_chars.A,
+        'm', 'M' => locale_chars.M,
         ':' => locale_chars.S,
         else => locale_chars.E,
     };
diff --git a/src/bigclock/Lang.zig b/src/bigclock/Lang.zig
index 6ba8cf1..d11aac9 100644
--- a/src/bigclock/Lang.zig
+++ b/src/bigclock/Lang.zig
@@ -21,5 +21,8 @@ pub const LocaleChars = struct {
     NINE:   [SIZE]u21,
     S:      [SIZE]u21,
     E:      [SIZE]u21,
+    P:      [SIZE]u21,
+    A:      [SIZE]u21,
+    M:      [SIZE]u21,
 };
 // zig fmt: on
diff --git a/src/bigclock/en.zig b/src/bigclock/en.zig
index 868656a..42a45f9 100644
--- a/src/bigclock/en.zig
+++ b/src/bigclock/en.zig
@@ -90,5 +90,26 @@ pub const locale_chars = LocaleChars{
         O,O,O,O,O,
         O,O,O,O,O,
     },
+    .P = [_]u21{
+        X,X,X,X,X,
+        X,X,O,X,X,
+        X,X,X,X,X,
+        X,X,O,O,O,
+        X,X,O,O,O,
+    },
+    .A = [_]u21{
+        X,X,X,X,X,
+        X,X,O,X,X,
+        X,X,X,X,X,
+        X,X,O,X,X,
+        X,X,O,X,X,
+    },
+    .M = [_]u21{
+        X,X,X,X,X,
+        X,O,X,O,X,
+        X,O,X,O,X,
+        X,O,O,O,X,
+        X,O,O,O,X,
+    },
 };
-// zig fmt: on
\ No newline at end of file
+// zig fmt: on
diff --git a/src/bigclock/fa.zig b/src/bigclock/fa.zig
index 63a897a..acfde42 100644
--- a/src/bigclock/fa.zig
+++ b/src/bigclock/fa.zig
@@ -76,6 +76,27 @@ pub const locale_chars = LocaleChars{
         O,O,O,X,O,
         O,O,O,X,O,
     },
+    .P = [_]u21{
+        O,O,O,O,O,
+        O,O,O,O,O,
+        O,O,O,O,O,
+        O,O,O,O,O,
+        O,O,O,O,O,
+    },
+    .A = [_]u21{
+        O,O,O,O,O,
+        O,O,O,O,O,
+        O,O,O,O,O,
+        O,O,O,O,O,
+        O,O,O,O,O,
+    },
+    .M = [_]u21{
+        O,O,O,O,O,
+        O,O,O,O,O,
+        O,O,O,O,O,
+        O,O,O,O,O,
+        O,O,O,O,O,
+    },
     .S = [_]u21{
         O,O,O,O,O,
         O,O,X,O,O,
@@ -91,4 +112,4 @@ pub const locale_chars = LocaleChars{
         O,O,O,O,O,
     },
 };
-// zig fmt: on
\ No newline at end of file
+// zig fmt: on
diff --git a/src/config/Config.zig b/src/config/Config.zig
index 6a8ba18..2399898 100644
--- a/src/config/Config.zig
+++ b/src/config/Config.zig
@@ -13,6 +13,8 @@ asterisk: ?u32 = '*',
 auth_fails: u64 = 10,
 bg: u32 = 0x00000000,
 bigclock: Bigclock = .none,
+bigclock_12hr: bool = false,
+bigclock_seconds: bool = false,
 blank_box: bool = true,
 border_fg: u32 = 0x00FFFFFF,
 box_title: ?[]const u8 = null,
diff --git a/src/main.zig b/src/main.zig
index f70f93b..e288e0a 100644
--- a/src/main.zig
+++ b/src/main.zig
@@ -482,11 +482,19 @@ pub fn main() !void {
             }
 
             if (config.bigclock != .none and buffer.box_height + (bigclock.HEIGHT + 2) * 2 < buffer.height) {
-                const format = "%H:%M";
+                var format_buf: [16:0]u8 = undefined; 
+                var clock_buf: [32:0]u8 = undefined;
+                // We need the slice/c-string returned by `bufPrintZ`.
+                const format: [:0]const u8 = try std.fmt.bufPrintZ(&format_buf, "{s}{s}{s}{s}",
+                    .{
+                        if (config.bigclock_12hr) "%I" else "%H",
+                        ":%M",
+                        if (config.bigclock_seconds) ":%S" else "",
+                        if (config.bigclock_12hr) "%P" else ""
+                    });
                 const xo = buffer.width / 2 - @min(buffer.width, (format.len * (bigclock.WIDTH + 1))) / 2;
                 const yo = (buffer.height - buffer.box_height) / 2 - bigclock.HEIGHT - 2;
 
-                var clock_buf: [format.len + 1:0]u8 = undefined;
                 const clock_str = interop.timeAsString(&clock_buf, format);
 
                 for (clock_str, 0..) |c, i| {