Update equality

fhirpathpy/engine/invocations/equality.py

@@ -19,7 +19,15 @@ def equality(ctx, x, y):
     if len(x) != len(y):
         return False
 
-    return util.parse_value(x[0]) == util.parse_value(y[0])
+    a = util.parse_value(x[0])
+    b = util.parse_value(y[0])
+
+    if isinstance(a, nodes.FP_Quantity) and isinstance(b, nodes.FP_Quantity):
+        y_unit = getattr(b, 'unit', None)
+        if y_unit in nodes.FP_Quantity.mapUCUMCodeToTimeUnits.values():
+            return a.deep_equal(b)
+
+    return a == b
 
 
 def normalize_string(s):

fhirpathpy/engine/nodes.py

@@ -79,6 +79,17 @@ class FP_Quantity(FP_Type):
         "'ms'": "'ms'",
     }
 
+    mapUCUMCodeToTimeUnits = {
+        "'a'": "year",
+        "'mo'": "month",
+        "'wk'": "week",
+        "'d'": "day",
+        "'h'": "hour",
+        "'min'": "minute",
+        "'s'": "second",
+        "'ms'": "millisecond",
+    }
+
     """
     A map of the UCUM units that must be paired with integer values when doing arithmetic.
     """