2-day ticks between months

[FlorianDr]

Hey there,

I'm trying to create uniformly-spaced time ticks with 'time.ticks()'. However, the function returns non equidistant intervals for the 2-day ticks going over the end of a month. Here is an example:

https://jsfiddle.net/6vopq2by/

The document states "The returned tick values are uniformly-spaced (mostly)". Why "mostly"?

How can I achieve my use cases for the provided instance? Will I need to make use of '.every()' with a custom interval?

Thank you in advance,
Florian

[mbostock]

See interval.every:

The meaning of step is dependent on this interval’s parent interval as defined by the field function. For example, d3.timeMinute.every(15) returns an interval representing every fifteen minutes, starting on the hour: :00, :15, :30, :45, etc. Note that for some intervals, the resulting dates may not be uniformly-spaced; d3.timeDay’s parent interval is d3.timeMonth, and thus the interval number resets at the start of each month.

If you want every other day rather than every odd date, then you need to create a custom time interval and use that instead of time.ticks() (which uses d3.timeTicks or d3.utcTicks internally). Here’s how you would do that:

https://observablehq.com/d/906f777c9f2f0701

[FlorianDr]

Awesome! Thank you for the fast response, @mbostock