# Options on the X-Axis tab of the Trend Object Properties dialog box

The following table shows the options on the X-Axis tab of the Trend Object Properties dialog box.

Options | Descriptions
--- | ---
Start date and Start time | Together, these two options determine the starting date and starting time on the left edge of the chart. As the chart scrolls with new data, it updates with the latest data for the specified time span. The start date and start time serve only as starting points on the chart. The start date must fall between 1/1/1992 and 12/31/2037. To select a date from the calendar, click the Down Arrow beside the Start date box. To select a time, click the Up or Down arrow beside the Start time box. Start date and Start time are disabled when scrolling is allowed. To enable Start date and Start time, clear the Allow scrolling check box on the Display tab.
Time span | Type a time and then click a time unit to specify the amount of data the trend chart displays at runtime. For a standard line chart, the time span controls the chart's horizontal scale. For an XY plot, the Min and Max properties configured on the Pens tab of the selected pen control the horizontal scale, and the time span controls the number of data points plotted. When configured through the X-Axis tab, the time span does not have a specific limit. The only limitation is that the time span cannot be so large that the start date plus the time span is later than 12/31/2037 when not scrolling. Also, the current date minus the time span cannot be earlier than 1/1/1992 when scrolling.
Display scale | Specifies whether an x-axis label appears at the bottom of the chart. For a standard line chart, the labels show the start and end times. For an XY plot, the labels show the minimum and maximum value range of the pen selected as the x-axis. If there is room, intermediate values are shown as well.
Display grid lines | Select this check box to show vertical grid lines on the chart.
Grid lines | Specifies how many vertical grid ines to show on the chart. Available values are 0-30.
Minor grid lines | Specifies how many minor vertical grid lines to show on the chart. These lines appear between the major grid lines and do not have axis values shown. Available values are 0-10.
Grid color | Specifies the color of the vertical grid lines.

## See also

Options on the Display tab of the Trend Object Properties dialog box

Set up the horizontal axis for the trend