Single moment range support and adjacent new ranges intersection interpretation

README.md

@@ -256,6 +256,22 @@ What are the intersecting ranges?
 range.intersect(range2); // [moment.range(lol, end)]
 ```
 
+Include adjacent ranges:
+
+``` js
+const a = moment('2016-03-15');
+const b = moment('2016-03-20');
+const c = moment('2016-03-20');
+const d = moment('2016-03-25');
+
+const range1 = moment.range(a, b);
+const range2 = moment.range(c, d);
+
+range1.intersect(range2)                      // null
+range1.intersect(range2, { adjacent: false }) // null
+range1.intersect(range2, { adjacent: true })  // [moment.range('2016-03,20', '2016-03,20')]
+```
+
 ### Manipulation
 
 #### Add

lib/moment-range.js

@@ -151,7 +151,7 @@ export class DateRange {
     return this.diff(unit, rounded);
   }
 
-  intersect(other) {
+  intersect(other, options = { adjacent: false }) {
     const start = this.start.valueOf();
     const end = this.end.valueOf();
     const oStart = other.start.valueOf();
@@ -169,6 +169,14 @@ export class DateRange {
     else if ((start <= oStart) && (oStart <= oEnd) && (oEnd <= end)) {
       return other;
     }
+    else if (options.adjacent) {
+      if ((start <= end) && (end == oStart) && (oStart <= oEnd)) {
+        return new this.constructor(end, end);
+      }
+      else if ((oStart <= oEnd) && (oEnd == start) && (start <= end)) {
+        return new this.constructor(oEnd, oEnd);
+      }
+    }
 
     return null;
   }