diff --git a/homeassistant/components/moehlenhoff_alpha2/__init__.py b/homeassistant/components/moehlenhoff_alpha2/__init__.py
index b2d3438250f..2a254ee0ef4 100644
--- a/homeassistant/components/moehlenhoff_alpha2/__init__.py
+++ b/homeassistant/components/moehlenhoff_alpha2/__init__.py
@@ -17,7 +17,7 @@ from .const import DOMAIN
 
 _LOGGER = logging.getLogger(__name__)
 
-PLATFORMS = [Platform.CLIMATE, Platform.SENSOR, Platform.BINARY_SENSOR]
+PLATFORMS = [Platform.BUTTON, Platform.CLIMATE, Platform.SENSOR, Platform.BINARY_SENSOR]
 
 UPDATE_INTERVAL = timedelta(seconds=60)
 
diff --git a/homeassistant/components/moehlenhoff_alpha2/button.py b/homeassistant/components/moehlenhoff_alpha2/button.py
new file mode 100644
index 00000000000..4a8f21b089d
--- /dev/null
+++ b/homeassistant/components/moehlenhoff_alpha2/button.py
@@ -0,0 +1,41 @@
+"""Button entity to set the time of the Alpha2 base."""
+
+from homeassistant.components.button import ButtonEntity
+from homeassistant.config_entries import ConfigEntry
+from homeassistant.core import HomeAssistant
+from homeassistant.helpers.entity import EntityCategory
+from homeassistant.helpers.entity_platform import AddEntitiesCallback
+from homeassistant.helpers.update_coordinator import CoordinatorEntity
+from homeassistant.util import dt
+
+from . import Alpha2BaseCoordinator
+from .const import DOMAIN
+
+
+async def async_setup_entry(
+    hass: HomeAssistant,
+    config_entry: ConfigEntry,
+    async_add_entities: AddEntitiesCallback,
+) -> None:
+    """Add Alpha2 button entities."""
+
+    coordinator: Alpha2BaseCoordinator = hass.data[DOMAIN][config_entry.entry_id]
+
+    async_add_entities([Alpha2TimeSyncButton(coordinator, config_entry.entry_id)])
+
+
+class Alpha2TimeSyncButton(CoordinatorEntity[Alpha2BaseCoordinator], ButtonEntity):
+    """Alpha2 virtual time sync button."""
+
+    _attr_name = "Sync time"
+    _attr_entity_category = EntityCategory.DIAGNOSTIC
+
+    def __init__(self, coordinator: Alpha2BaseCoordinator, entry_id: str) -> None:
+        """Initialize Alpha2TimeSyncButton."""
+        super().__init__(coordinator)
+
+        self._attr_unique_id = f"{entry_id}:sync_time"
+
+    async def async_press(self) -> None:
+        """Synchronize current local time from HA instance to base station."""
+        await self.coordinator.base.set_datetime(dt.now())