diff --git a/.jshintrc b/.jshintrc
index 9bf58ac..4a2f904 100644
--- a/.jshintrc
+++ b/.jshintrc
@@ -10,5 +10,5 @@
   "sub": true,
   "undef": true,
   "unused": true,
-  "esversion": 10
+  "esversion": 11
 }
diff --git a/lib/ical.js b/lib/ical.js
index 3a06285..950d718 100644
--- a/lib/ical.js
+++ b/lib/ical.js
@@ -20,7 +20,11 @@ function ts2date(ts) {
   return new Date(ts).toISOString().replace(/[-:]/g, '').slice(0, -5);
 }
 
-function* ical({ metadata, routes }) {
+function tzid(property, tz) {
+  return tz ? `${property};TZID=${tz}` : property;
+}
+
+function* ical({ metadata, routes, options = {} }) {
   const dtstamp = ts2date(Date.now());
 
   yield* property('BEGIN', 'VCALENDAR');
@@ -41,8 +45,9 @@ function* ical({ metadata, routes }) {
     yield* property('URL', step.url);
     yield* property('LOCATION', step.address);
     yield* property('GEO', [step.coordinates.lat, step.coordinates.lon], formatArray);
-    yield* property('DTSTART', ts2date(step.arrival_time));
-    yield* property('DTEND', ts2date(step.departure_time));
+    const tz = options.tzid && step.timezone?.name;
+    yield* property(tzid('DTSTART', tz), ts2date(step.arrival_time));
+    yield* property(tzid('DTEND', tz), ts2date(step.departure_time));
     yield* property('END', 'VEVENT');
   }
   yield* property('END', 'VCALENDAR');
diff --git a/test/fixtures/simple-trip.json b/test/fixtures/simple-trip.json
index 564db58..377294d 100644
--- a/test/fixtures/simple-trip.json
+++ b/test/fixtures/simple-trip.json
@@ -34,7 +34,10 @@
           "visit_duration": 0,
           "nights": 0,
           "arrival_time": 1373274000000,
-          "departure_time": 1373274000000
+          "departure_time": 1373274000000,
+          "timezone": {
+            "name": "America/Los_Angeles"
+          }
         },
         {
           "id": "5144f7cbd6e4d26079000009",
@@ -58,7 +61,10 @@
           "driving": 11580,
           "nights": 0,
           "arrival_time": 1373285580000,
-          "departure_time": 1373286480000
+          "departure_time": 1373286480000,
+          "timezone": {
+            "name": "America/Los_Angeles"
+          }
         },
         {
           "id": "5144f7dfd6e4d2607900000a",
@@ -84,6 +90,9 @@
           "nights": 0,
           "arrival_time": 1373304660000,
           "departure_time": 1373305560000,
+          "timezone": {
+            "name": "America/Los_Angeles"
+          },
           "symbol": "Gas Station"
         },
         {
@@ -108,10 +117,13 @@
           "driving": 6595,
           "nights": 0,
           "arrival_time": 1373312155000,
-          "departure_time": 1373312155000
+          "departure_time": 1373312155000,
+          "timezone": {
+            "name": "America/Los_Angeles"
+          }
         }
       ],
       "name": ""
     }
   ]
-}
\ No newline at end of file
+}
diff --git a/test/fixtures/simple_tz.ics b/test/fixtures/simple_tz.ics
new file mode 100644
index 0000000..7305c3e
--- /dev/null
+++ b/test/fixtures/simple_tz.ics
@@ -0,0 +1,41 @@
+BEGIN:VCALENDAR
+VERSION:2.0
+PRODID:-//code42day//Furkot - road trip planner//EN
+BEGIN:VEVENT
+DTSTAMP:20220529T071758
+UID:50d1b16d-3cc5-501a-9ab1-fa68286a011f@furkot.com
+SUMMARY:San Francisco
+LOCATION:San Francisco\, CA
+GEO:37.7749295;-122.41941550000001
+DTSTART;TZID=America/Los_Angeles:20130708T090000
+DTEND;TZID=America/Los_Angeles:20130708T090000
+END:VEVENT
+BEGIN:VEVENT
+DTSTAMP:20220529T071758
+UID:d2a184cf-7264-570f-9880-003054b10222@furkot.com
+SUMMARY:Redding
+LOCATION:1510 Gordon Lane\, Redding\, CA 96002\, USA
+GEO:40.54720023441049;-122.34375
+DTSTART;TZID=America/Los_Angeles:20130708T121300
+DTEND;TZID=America/Los_Angeles:20130708T122800
+END:VEVENT
+BEGIN:VEVENT
+DTSTAMP:20220529T071758
+UID:b66792fd-6bd2-5c84-91e7-27c6cd532a54@furkot.com
+SUMMARY:Lane
+LOCATION:51-559 Walnut Place\, Springfield\, OR 97477\, USA
+GEO:44.04811573082351;-123.046875
+DTSTART;TZID=America/Los_Angeles:20130708T173100
+DTEND;TZID=America/Los_Angeles:20130708T174600
+END:VEVENT
+BEGIN:VEVENT
+DTSTAMP:20220529T071758
+UID:924fc5db-ab1d-5406-8a50-af6943d1c2f1@furkot.com
+SUMMARY:Portland
+DESCRIPTION:Trip notes for first stop
+LOCATION:Portland\, OR
+GEO:45.5234515;-122.6762071
+DTSTART;TZID=America/Los_Angeles:20130708T193555
+DTEND;TZID=America/Los_Angeles:20130708T193555
+END:VEVENT
+END:VCALENDAR
diff --git a/test/ical.js b/test/ical.js
index 0c87913..0b6aef3 100644
--- a/test/ical.js
+++ b/test/ical.js
@@ -45,6 +45,14 @@ describe('ical', function () {
     compareLines(generated, expected);
   });
 
+  it('simple trip with TZID', function () {
+    const t = require('./fixtures/simple-trip.json');
+    const generated = ical({ ...t, options: { tzid: true } });
+    const expected = readFileSync('fixtures/simple_tz.ics');
+
+    compareLines(generated, expected);
+  });
+
   it('multi trip', function () {
     const t = require('./fixtures/multi-trip.json');
     const generated = ical(t);