- Qt 6.11
- Qt Graphs
- QML Types
- QtGraphs
- DateTimeAxis
- Qt Graphs | Commercial or GPLv3

# DateTimeAxis QML Type

Adds DateTime items to a graph's axis. More...

Import Statement: | `import QtGraphs`
In C++: | QDateTimeAxis
Inherits: | AbstractAxis

- List of all members, including inherited members
- DateTimeAxis is part of Qt Graphs QML Types for 2D.

## Properties

- labelFormat : string
- max : real
- min : real
- pan : real `(since 6.11)`
- subTickCount : int
- tickInterval : real
- timeZone : QTimeZone `(since 6.11)`
- visualMax : real `(since 6.11)`
- visualMin : real `(since 6.11)`
- zoom : real `(since 6.11)`

## Signals

- labelFormatChanged(string format)
- maxChanged(DateTime max)
- minChanged(DateTime min)
- rangeChanged(real min, real max)
- subTickCountChanged(int subTickCount)
- tickIntervalChanged(real tickInterval)
- timeZoneChanged() `(since 6.11)`
- zoomChanged() `(since 6.11)`

## Methods

- string timeZoneAsString() `(since 6.11)`
- QTimeZone timeZoneFromString(string zoneId) `(since 6.11)`

## Detailed Description

A DateTime Axis can be used to display DateTime representations with tick marks and grid lines. The DateTime items on the axis are displayed at the position of the ticks.

The following example code illustrates how to use the DateTimeAxis type:

     GraphsView {
         axisX: DateTimeAxis {
             min: new Date(2000,1,1)
             max: new Date(1970,1,1)
         }
         LineSeries {
             // Add a few XYPoint data...
         }
     }

## Property Documentation

### labelFormat : string

The format of the DateTime labels on the axis The format property allows to signify the visual representation of the DateTime object, in days, months, and years. The default value is dd-MMMM-yy.

### max : real

The maximum value on the axis.

This value can be lower or higher than the minimum. The DateTime is stored as UTC internally. The default value is new Date(1980,1,1)

### min : real

The minimum value on the axis.

This value can be lower or higher than the maximum. The DateTime is stored as UTC internally. The default value is new Date(1970,1,1)

### pan : real `[since 6.11]`

The pan value of the axis.

The pan value moves the center of the axis without affecting intervals of grid and labels. The default value is 0.

This property was introduced in Qt 6.11.

### subTickCount : int

The number of subticks on the axis. This indicates how many subticks are drawn between major lines on the graph. Labels are not drawn for subticks. The default value is 0.

### tickInterval : real

The amount of major ticks are placed on an axis. If value is 0 or lower, axis will automatically calculate appropriate amount of ticks. The default value is 0.

### timeZone : QTimeZone `[since 6.11]`

The time zone that will be used to display labels of the axis. The accepted values are based on IANA time zone IDs. The default time zone is UTC.

This property was introduced in Qt 6.11.

### visualMax : real `[read-only, since 6.11]`

The visual maximum value of the axis.

This property holds a a visual maximum axis value when axis has been panned or zoomed. The default value is max

This property was introduced in Qt 6.11.

### visualMin : real `[read-only, since 6.11]`

The visual minimum value of the axis.

This property holds a a visual minimum axis value when axis has been panned or zoomed. The default value is min

This property was introduced in Qt 6.11.

### zoom : real `[since 6.11]`

The zoom value of the axis. The zoom value enlarges or shrinks the axis and thus the graph without affecting intervals of grid and labels. The default value is 1.

This property was introduced in Qt 6.11.

## Signal Documentation

### labelFormatChanged(string format)

This signal is emitted when the format of axis labels changes.

Note: The corresponding handler is `onLabelFormatChanged`.

### maxChanged(DateTime max)

This signal is emitted when the maximum value of the axis, specified by max, changes.

Note: The corresponding handler is `onMaxChanged`.

### minChanged(DateTime min)

This signal is emitted when the minimum value of the axis, specified by min, changes.

Note: The corresponding handler is `onMinChanged`.

### rangeChanged(real min, real max)

This signal is emitted when the minimum or maximum value of the axis, specified by min and max, changes.

Note: The corresponding handler is `onRangeChanged`.

### subTickCountChanged(int subTickCount)

This signal is emitted when the number of subticks on the axis, specified by subTickCount, changes.

Note: The corresponding handler is `onSubTickCountChanged`.

### tickIntervalChanged(real tickInterval)

This signal is emitted when the tick interval value, specified by tickInterval, changes.

Note: The corresponding handler is `onTickIntervalChanged`.

### `[since 6.11]` timeZoneChanged()

This signal is emitted when the time zone is changed. It represents a string value for the IANA time zone ID that was set.

Note: The corresponding handler is `onTimeZoneChanged`.

This signal was introduced in Qt 6.11.

### `[since 6.11]` zoomChanged()

This signal is emmited when the zoom value changes.

Note: The corresponding handler is `onZoomChanged`.

This signal was introduced in Qt 6.11.

## Method Documentation

### `[since 6.11]` string timeZoneAsString()

Returns the QDateTimeAxis::timeZone's IANA based zone ID as a string.

This method was introduced in Qt 6.11.

See also timeZone.

### `[since 6.11]` QTimeZone timeZoneFromString(string zoneId)

Returns the QTimeZone corresponding to IANA based zoneId.

Note: This is the converter method for setting the timeZone.

This method was introduced in Qt 6.11.

See also QDateTimeAxis::timeZone and timeZoneAsString.