Shouldn't scaleDateTime() work by default with Instant?

[AndreiKingsley]

We can use Instant as the data type, but we need to add scaleDatetime() to format the axis correctly. Why don't we do this automatically when we have Instant as a data type? Including in the case of yMin, middle etc. It's also a bit strange that the public api lacks something like scaleColorDatetime, but we can implement it with

Scale(Aes.COLOR, otherOptions = Options(
        mapOf(
            Option.Scale.DATE_TIME to true
        ))
)

[IKupriyanov-HORIS]

Hi!
Sorry, the issue description is kinda unclear. May I clarify it? Are you talking about the plot legend that uses numbers as labels instead of formatted date/time?

Like in this example:

%use lets-plot
import java.time.Instant.parse

val instants = listOf(
    "2021-01-01T00:00:00Z",
    "2021-02-23T00:00:00Z",
    "2021-04-03T00:00:00Z",
    "2021-05-04T00:00:00Z",
    "2021-10-05T00:00:00Z"
).map(::parse)

val daysData = mapOf<String, Any>(
    "days" to instants,
    "val" to (1..instants.size)
)

val p = letsPlot(daysData) + geomBar() { x = "days"; color = "days" }
p

Actual result:

And you expected this?

Am I correct?

[AndreiKingsley]

Yes!

[AndreiKingsley]

Also i want axis formatting when i use, for example, error bar:
`val instants = listOf(
"2021-01-01T00:00:00Z",
"2021-01-01T00:04:00Z",
"2021-01-01T00:00:00Z",
"2021-01-01T00:00:00Z",
"2021-01-01T00:00:00Z",
).map(::parse)
val instants2 = listOf(
"2021-01-01T00:05:00Z",
"2021-01-01T00:05:00Z",
"2021-01-01T00:05:00Z",
"2021-01-01T00:05:00Z",
"2021-01-01T00:05:00Z",
).map(::parse)
val daysData = mapOf<String, Any>(
"t1" to instants,
"t2" to instants2,
"val" to (1..instants.size)
)

val p = letsPlot(daysData) + geomErrorBar(stat = Stat.identity) {
x = "val";
ymin = "t1"
ymax = "t2"
}
p`
gives

but I expect y date-time formatting

[alshan]

Fixed in LPK v4.4.0