Walls accepts invalid dates where day-of-month is invalid (example June 31 is accepted but June only has 30 days)

[vaxheadroom]

Day-of-month validation for #DATE directive is overly simplistic. Walls only checks to make sure day-of-month is <=31. "31" is accepted for months with only 30 days. 29,30 and 31 are accepted for February which has only 28 or 29 days, depending on leap-year.

This issue does not appear to be causing problem within Walls, including date-based magnetic declination calculations.

However, breakage occurs downstream during processing of Walls-exported "shapefiles" if one attempts to cast the survey date into a field type of "date" (the Walls-exported shapefile uses field type of "text", which prevents date-based math). Similar issues may be encountered by other apps which attempt to processes the native Walls .srv files.

Was not able to identify the offending source code.