Free time and date tools: zones, equinoxes, countdowns

Time is a rule, not a number: an offset, a daylight-saving policy and the history of every change a government made to either. The tools on this page read that rule for a place, or solve for the instants the sky defines, which no table keeps right for long. All of them give their instants in UTC where the moment is one for the whole planet, and on the local clock where a place is named.

Which tool answers which question

• What time is it in Tokyo right now? The local time tool answers with the zone, the offset, daylight saving and the last clock change, converts a meeting between two cities, and hands over the epoch, ISO 8601 and Discord forms of the instant.
• When exactly is the equinox this year? The equinox and solstice dates tool solves the four instants to the minute, with the cross-quarter days, perihelion and aphelion, and your own longest and shortest day.
• Which planets are retrograde, and until when? The retrograde calendar lists every period of a year, downloadable or subscribable.
• What light is it in my city at this moment? The sky colour tool names the hour, golden or blue, and says when the light changes next.
• Where will the Sun be during my trip? The which side to sit tool follows a departure time along the way between two cities.

Why a city rather than an offset

UTC+1 is true of Paris in January and false in July, and CST means three different things on three continents. A city, or its IANA identifier, designates one rule, past and future. Every tool here resolves the place first and states the identifier it used, so an answer can be checked rather than trusted.