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Moon phase
The phase and how much is lit, from a mean lunation that says its error.
It runs entirely in this browser tab: what you type is never uploaded, and the tool makes no network request while it works. Open your browser's network panel and try it — nothing leaves the page. There is no sign-up and no account.
Settings
- Month before day
- Only for a date like 03/04 — a four-digit year first is never ambiguous.
- Weeks ahead
- One row a week, which is how the Moon is planned around. A number from 0 to 24.
How to use it
- Paste your text into the box above, or open a file.
- Adjust the settings beside it until the result is what you wanted.
- Copy the result, or save it as a file. The result updates as you type.
Questions
- Is 03/04/2024 the third of April or the fourth of March?
- Both, and no parser can tell. Every tool that reads a date has a setting for the order, and a four-digit year first is never ambiguous whatever the setting says. The format converter goes further: it counts the dates in a column that can only be read one way, and warns when the column disagrees with itself.
- Are the public holidays accurate?
- They are rules rather than dates — a fixed day, an offset from Easter, or the nth weekday of a month — so they work for any year. They are not a legal source: holidays are moved, added and removed by decree, and regional ones are not here at all. Every result that uses them says so.
- Does it know about time zones?
- No, deliberately. A time-zone database is several megabytes, larger than this whole application, and it is revised several times a year — a stale copy would put a meeting an hour out for half of Europe every spring. The meeting planner takes offsets from you and says it knows nothing about daylight saving.
- Is what I type uploaded anywhere?
- No. This page carries the whole tool as WebAssembly and runs it on your own device. Nothing you type is sent anywhere.
Other tools for one date
Countdown
How long until a date, in every unit somebody counts it in.
Half birthday and milestones
The half birthday, and the round numbers of a life with their dates.
Zodiac sign
The western sign and the Chinese animal, with both boundaries stated.
Pet age
A dog's or a cat's age by a published curve, not by seven.
All twenty-five tools