Nivo: Monthly Line Chart values off by one

[annaloukianova]

Describe/explain the bug
When given monthly data on a line chart, the x-axis is off-by-one by apparently rounding the month down. Messing with the xScale precision makes this problem worse.

To Reproduce
https://codesandbox.io/s/nivoline-off-values-z5hm9
If you look at the data, it goes from "2018-08" to "2019-05". However, the axes and the data points when you hover over them are "mislabeled" so that { x: "2018-08", y: 16 } becomes { x: "2018-07", y: 16 }

Expected behavior
Data points to be labeled as they are given in the data array, with the correct month in the x-axis.

Screenshots

Desktop (please complete the following information):

• OS: MacOS 10.13.6
• Browser: Chrome
• Version 0.58.1, react 16.8.1

Additional context
In the discord channel, it seemed like this might be a timezone issue... I am in MST(+7)

[wyze]

If you add useUTC: false to your xScale, it appears to fix it. I'm not sure what is going on around all the UTC/non-UTC stuff.

[annaloukianova]

Thanks!