SetXTimeFormat
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## SetXTimeFormat

SetXTimeFormat — Set date/time formatting string for X labels

## Synopsis

    $plot->SetXTimeFormat($xtf)

## Description

`SetXTimeFormat` sets the formatting string for X tick and data labels when 'time' formatting mode for X labels is in effect. Use SetXLabelType to select the formatting mode for labels. The formatting string is used with the PHP `strftime` to format labels as date/time strings.

## Parameters

`$xtf`

  Formatting string for X labels, used with `strftime()`. For example, if the label value is 1104534000 (which is the `time_t` representation of 6:00 PM on the last day of 2004), '%Y-%m-%d.%H:%M:%S' results in '2004-12-31.18:00:00', and '%d %b %Y' results in '31 Dec 2004'.

## Notes

This applies to both X tick labels and X data labels. To use date/time formatting, the label values must be Unix time_t values (number of seconds since Unix epoch).

Unlike SetPrecisionX, SetXTimeFormat does not automatically enable the correct label formatting mode. You must call `SetXLabelType('time')` to use date/time formatting of labels.

The default time format is '%H:%M:%S', showing hours, minutes, and seconds (and ignoring any date information).

## History

Starting with PHPlot-5.0.6, the time format can be set with SetXLabelType instead.

The default time format was undefined prior to PHPlot-5.0rc3.

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