diff --git a/man/waybar-clock.5.scd b/man/waybar-clock.5.scd
index e3213f3..6684d89 100644
--- a/man/waybar-clock.5.scd
+++ b/man/waybar-clock.5.scd
@@ -65,6 +65,10 @@ The *clock* module displays the current date and time.
 
 View all valid format options in *strftime(3)*.
 
+# FORMAT REPLACEMENTS
+
+*{calendar}*: Current month calendar
+
 # EXAMPLES
 
 ```
diff --git a/meson.build b/meson.build
index 69439ac..812cc42 100644
--- a/meson.build
+++ b/meson.build
@@ -67,6 +67,7 @@ gtk_layer_shell = dependency('gtk-layer-shell-0',
         fallback : ['gtk-layer-shell', 'gtk_layer_shell_dep'])
 systemd = dependency('systemd', required: get_option('systemd'))
 tz_dep = dependency('date', default_options : [ 'use_system_tzdb=true' ], fallback: [ 'date', 'tz_dep' ])
+utfcpp = dependency('utfcpp', fallback: [ 'utfcpp', 'utfcpp_dep' ])
 
 prefix = get_option('prefix')
 conf_data = configuration_data()
@@ -168,7 +169,8 @@ executable(
         libudev,
         libmpdclient,
         gtk_layer_shell,
-        tz_dep
+        tz_dep,
+        utfcpp
     ],
     include_directories: [include_directories('include')],
     install: true,
diff --git a/resources/config b/resources/config
index 8dfa012..116d377 100644
--- a/resources/config
+++ b/resources/config
@@ -65,7 +65,7 @@
     },
     "clock": {
         // "timezone": "America/New_York",
-        "tooltip-format": "{:%Y-%m-%d | %H:%M}",
+        "tooltip-format": "<big>{:%Y %B}</big>\n<tt><small>{calendar}</small></tt>",
         "format-alt": "{:%Y-%m-%d}"
     },
     "cpu": {
diff --git a/src/modules/clock.cpp b/src/modules/clock.cpp
index 38af115..f918137 100644
--- a/src/modules/clock.cpp
+++ b/src/modules/clock.cpp
@@ -1,4 +1,86 @@
 #include "modules/clock.hpp"
+#include <sstream>
+#include <utf8.h>
+
+using zoned_time = date::zoned_time<std::chrono::system_clock::duration>;
+
+struct waybar_time {
+  std::locale locale;
+  zoned_time ztime;
+};
+
+namespace {
+
+size_t utf8_strlen(const std::string& s) {
+  return utf8::distance(s.begin(), s.end());
+}
+
+std::string utf8_substr(const std::string s, size_t len) {
+  utf8::iterator it(s.begin(), s.begin(), s.end());
+  for (size_t i = 0; i < len; ++i) {
+    ++it;
+  }
+  int byte_count = it.base() - s.begin();
+  return s.substr(0, byte_count);
+}
+
+void weekdays_header(const std::locale& locale, const date::weekday& first_dow, std::ostream& os) {
+  auto wd = first_dow;
+  do {
+    if (wd != first_dow) os << ' ';
+    auto wd_string = date::format(locale, "%a", wd);
+    auto wd_string_len = utf8_strlen(wd_string);
+    if (wd_string_len > 2) {
+      wd_string = utf8_substr(wd_string, 2);
+      wd_string_len = 2;
+    }
+    const std::string pad(2 - wd_string_len, ' ');
+    os << pad << wd_string;
+  } while (++wd != first_dow);
+  os << "\n";
+}
+
+std::string calendar_text(const waybar_time& wtime, const date::weekday& first_dow) {
+  const auto daypoint = date::floor<date::days>(wtime.ztime.get_local_time());
+  const auto ymd = date::year_month_day(daypoint);
+  const date::year_month ym(ymd.year(), ymd.month());
+  const auto curr_day = ymd.day();
+
+  std::stringstream os;
+  weekdays_header(wtime.locale, first_dow, os);
+
+  // First week prefixed with spaces if needed.
+  auto wd = date::weekday(ym/1);
+  auto empty_days = (wd - first_dow).count();
+  if (empty_days > 0) {
+    os << std::string(empty_days * 3 - 1, ' ');
+  }
+  auto d = date::day(1);
+  do {
+    if (wd != first_dow) os << ' ';
+    if (d == curr_day) {
+      os << "<b><u>" << date::format("%e", d) << "</u></b>";
+    } else {
+      os << date::format("%e", d);
+    }
+    ++d;
+  } while (++wd != first_dow);
+
+  // Following weeks.
+  auto last_day = (ym/date::literals::last).day();
+  for ( ; d <= last_day; ++d, ++wd) {
+    os << ((wd == first_dow) ? '\n' : ' ');
+    if (d == curr_day) {
+      os << "<b><u>" << date::format("%e", d) << "</u></b>";
+    } else {
+      os << date::format("%e", d);
+    }
+  }
+
+  return os.str();
+}
+
+}
 
 waybar::modules::Clock::Clock(const std::string& id, const Json::Value& config)
     : ALabel(config, "clock", id, "{:%H:%M}", 60)
@@ -24,13 +106,6 @@ waybar::modules::Clock::Clock(const std::string& id, const Json::Value& config)
   };
 }
 
-using zoned_time = date::zoned_time<std::chrono::system_clock::duration>;
-
-struct waybar_time {
-  std::locale locale;
-  zoned_time ztime;
-};
-
 auto waybar::modules::Clock::update() -> void {
   if (!fixed_time_zone_) {
     // Time zone can change. Be sure to pick that.
@@ -44,11 +119,12 @@ auto waybar::modules::Clock::update() -> void {
 
   if (tooltipEnabled()) {
     if (config_["tooltip-format"].isString()) {
+      const auto calendar = calendar_text(wtime, date::Sunday);
       auto tooltip_format = config_["tooltip-format"].asString();
-      auto tooltip_text = fmt::format(tooltip_format, wtime);
-      label_.set_tooltip_text(tooltip_text);
+      auto tooltip_text = fmt::format(tooltip_format, wtime, fmt::arg("calendar", calendar));
+      label_.set_tooltip_markup(tooltip_text);
     } else {
-      label_.set_tooltip_text(text);
+      label_.set_tooltip_markup(text);
     }
   }
 }
diff --git a/subprojects/utfcpp.wrap b/subprojects/utfcpp.wrap
new file mode 100644
index 0000000..51cf131
--- /dev/null
+++ b/subprojects/utfcpp.wrap
@@ -0,0 +1,9 @@
+[wrap-file]
+directory = utfcpp-2.3.5
+source_url = https://github.com/nemtrif/utfcpp/archive/v2.3.5.zip
+source_filename = utfcpp-2.3.5.zip
+source_hash = 1d5cb7d908202d734ec35b84087400013f352ffb4612e978ffb948986b76df14
+
+patch_url = https://github.com/mesonbuild/utfcpp/releases/download/2.3.5-1/utfcpp.zip
+patch_filename = utfcpp-2.3.5-1-wrap.zip
+patch_hash = 5f504de947b34bb5995fcdb66a1ea1392288076a9400ead829da79e73441a13f