Clock

Show Clock puts a clock at the far end of the bar, after the Trash — the corner the eye goes to for the time.

It is off by default, and it is the one thing here that duplicates something macOS already gives you: the menu bar’s own clock survives Eskele hiding the Dock. It earns its place on a full-width bar, where the far end is empty anyway.

Two styles

Digital	Time, or day and time, or day, date and time.
Dial	A drawn analogue face.

The 12- or 24-hour choice and the order of day and month come from System Settings ▸ Language & Region, so the reading agrees with the menu bar’s own clock rather than with a format of ours.

Digits are monospaced. Without that the cell changes width as the minutes tick over, and a full-width bar reflows every button beside it once a minute.

On a side bar

A side bar shows the time on two lines and no date. A bar one icon wide has nowhere to put “Thursday 3 September”, and an ellipsis where the clock was is worse than no date.

The calendar

Hover the clock for the month. That is an NSDatePicker in its graphical style rather than a grid of our own: it already knows which day the week starts on, how the month is named in your language and which day today is — all of which a hand-drawn grid would get wrong for somebody.

Clicking the clock opens whatever application handles calendar links, which is your calendar app whether or not it is Apple’s.

Ticking

The clock ticks at the top of each minute rather than every sixty seconds from whenever it started, so it changes when every other clock on the machine does.

No custom dials

uBar’s timepieces are folders of PNGs described by a plist — a plug-in format, and a plug-in format with one implementation is a file layout to maintain rather than a feature.

The dial is drawn from the current appearance’s own colours instead, which suits a bar that is already following the system’s light and dark.