Split Vietnam in two

Fixes #66

CHANGELOG.md

@@ -1,5 +1,12 @@
 ## Unreleased
 
+### Zone Changes
+
+* Split Vietnam into 2 zones ([#66](https://github.com/evansiroky/timezone-boundary-builder/issues/66))
+  * Make Northern Vietnam be a part of `Asia/Bangkok`
+  * Southern Vietnam stays `Asia/Ho_Chi_Minh`
+* Update to latest OSM data
+
 ### Other Changes
 
 * Add standard linter ([#67](https://github.com/evansiroky/timezone-boundary-builder/issues/67))

osmBoundarySources.json

@@ -1027,6 +1027,9 @@
   "Qatar": {
     "ISO3166-1": "QA"
   },
+  "Quang Tri": {
+    "ISO3166-2": "VN-25"
+  },
   "Quebec": {
     "ISO3166-2": "CA-QC"
   },

timezones.json

@@ -2659,6 +2659,20 @@
     {
       "op": "init",
       "source": "overpass",
+      "id": "Vietnam",
+      "description": "Northern Vietnam had the same timekeeping method as Thailand, so this is added before adding Thailand. See (https://github.com/evansiroky/timezone-boundary-builder/issues/66)"
+    }, {
+      "op": "intersect",
+      "source": "manual-polygon",
+      "data": [[[100,11],[112,21],[100,30],[100,11]]],
+      "description": "Isolate Northern Vietnam as it is a part of Asia/Bangkok. See (https://github.com/evansiroky/timezone-boundary-builder/issues/66)"
+    }, {
+      "op": "difference",
+      "source": "overpass",
+      "id": "Quang Tri"
+    }, {
+      "op": "union",
+      "source": "overpass",
       "id": "Thailand"
     }
   ],
@@ -2803,6 +2817,15 @@
       "op": "init",
       "source": "overpass",
       "id": "Vietnam"
+    }, {
+      "op": "difference",
+      "source": "manual-polygon",
+      "data": [[[100,11],[112,21],[100,30],[100,11]]],
+      "description": "Exclude Northern Vietnam as it is a part of Asia/Bangkok. See (https://github.com/evansiroky/timezone-boundary-builder/issues/66)"
+    }, {
+      "op": "union",
+      "source": "overpass",
+      "id": "Quang Tri"
     }, {
       "op": "difference",
       "source": "manual-polygon",