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How can I label the axes on my map with dates?
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To label a map with custom text labels, create additional post maps along the axis locations, overlay the post maps and label the points.

For example, in many cases users want date labels along their axes. The data could have been gridded using Julian dates, but you want to convert the Julian dates back to regular dates for the axis labels.

To label the bottom axis on a map with dates, follow these steps:

1.  Select the Bottom Axis in the Object Manager for the map (or whatever axes shows the Julian date values).

2.  In the Property Manager, on the General tab uncheck the Show checkbox.

3.  On the Ticks tab set the Major Ticks and Minor Ticks styles both to None.

4.  Select the Map in the Object Manager, and in the Property Manager, on the Limits tab, note the Y minimum value for the map.

5.  Open the Surfer worksheet, or an Excel worksheet, and create a data file with 3 columns of data for all the tick marks and labels you would like to see on the axis:

a.          X (Julian dates)

b.         Y (minimum Y value of map), this will all be the same Y value for all points

c.          label (regular dates) corresponding to the Julian dates on the same row

6.  Select the map and go to Map | Add | Post Layer, select the data file and click Open. If you are asked if you want to adjust the map limits, click No.

7.  Select the post map and in the Property Manager, make sure the post map uses the first two columns of data for the X and Y columns and uses the "+" symbol.

8.  Go to the Labels tab and set the label column to be the column containing the label data, and choose to position the labels below the symbol. 

9.  If you want to make adjustments to the date labels, select the post map, and in the Property Manager go to the Labels tab, and make font adjustments or placement changes here.

See also: How can I grid my data using date/times?
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