SetXTimeFormat — Set date/time formatting string for X labels
$plot->SetXTimeFormat($xtf)
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.
$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'.
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). This default applies to PHPlot-5.0rc3 and higher. In older versions, the default is undefined.