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Displays the current date, typically at 3 o'clock position via a window or pointer.

Shows both the day of the week and the date. Popularized by Rolex.

Tracks a second time zone using an additional hour hand and 24-hour bezel. Essential for travelers.

Displays time in multiple cities simultaneously. Uses a rotating city ring and 24-hour ring.

Stopwatch function with start/stop/reset. Measures elapsed time independently from main time.

Two chronograph hands that can be split to record intermediate/lap times while the other continues.

Resets and restarts the chronograph in a single button press, without needing to stop first.

Displays the current phase of the lunar cycle. Typical accuracy is one day deviation per 122 years.

Automatically accounts for months with 30 and 31 days. Only needs manual correction once per year (Feb to Mar).

Accounts for all month lengths including leap years. Correct until the year 2100 exception.

Shows the difference between solar time (sundial) and mean time (clock). Varies ±15 minutes throughout the year.

Chimes hours, quarter-hours, and minutes on demand using tiny gongs. One of the most prestigious complications.

Mechanical alarm function. Found in watches like the Vulcain Cricket and Jaeger-LeCoultre Memovox.

Rotates the escapement to counter gravity's effect on timekeeping. Originally for pocket watches. A prestige showcase.

Shows remaining energy in the mainspring. Like a fuel gauge for mechanical watches.

Measures current depth while diving. Uses water pressure through a sensor membrane or channel.