diff --git a/src/db/gpx.test.ts b/src/db/gpx.test.ts
index e99afc7..f8eb97f 100644
--- a/src/db/gpx.test.ts
+++ b/src/db/gpx.test.ts
@@ -57,6 +57,6 @@ describe('The gpx module', () => {
   });
   test('db.put() generates an id if needed', async () => {
     const id = await putNewGpx();
-    expect(id).toEqual({ gpx: '0' });
+    expect(id).toEqual({ gpx: '1970-01-01T00:00:00.000Z' });
   });
 });
diff --git a/src/db/gpx.ts b/src/db/gpx.ts
index 4b1af95..49b49c2 100644
--- a/src/db/gpx.ts
+++ b/src/db/gpx.ts
@@ -31,7 +31,9 @@ const emptyGpx: Gpx = {
   extensions: undefined,
 };
 
-export const putNewGpx = async (id: IdGpx = { gpx: Date.now().toString() }) => {
+export const putNewGpx = async (
+  id: IdGpx = { gpx: new Date(Date.now()).toISOString() }
+) => {
   const uri = getUri('gpx', id);
   await put(
     uri,
diff --git a/src/db/lib.test.ts b/src/db/lib.test.ts
index be629ab..efb09f3 100644
--- a/src/db/lib.test.ts
+++ b/src/db/lib.test.ts
@@ -26,23 +26,23 @@ describe('getFamily', () => {
   });
   test('returns two rows after a gpx and a track have been inserted.', async () => {
     await putNewTrk();
-    const allDocs: any = await getFamily(uri('gpx', { gpx: '0' }));
+    const allDocs: any = await getFamily(uri('gpx', { gpx: '' }));
     expect(allDocs).toMatchInlineSnapshot(`
 Object {
   "offset": 0,
   "rows": Array [
     Object {
-      "id": "gpx/0",
-      "key": "gpx/0",
+      "id": "gpx/1970-01-01T00%3A00%3A00.000Z",
+      "key": "gpx/1970-01-01T00%3A00%3A00.000Z",
       "value": Object {
-        "rev": "1-98d42c99fcf471a500b0506a60e77559",
+        "rev": "1-649694b1e46839ec63d2a93f483dd023",
       },
     },
     Object {
-      "id": "gpx/0/2trk/00000",
-      "key": "gpx/0/2trk/00000",
+      "id": "gpx/1970-01-01T00%3A00%3A00.000Z/2trk/00000",
+      "key": "gpx/1970-01-01T00%3A00%3A00.000Z/2trk/00000",
       "value": Object {
-        "rev": "1-1e197ef8965a436730f80cabaaaa6f70",
+        "rev": "1-e1e6888ad978a5fcc405a75296604bee",
       },
     },
   ],
@@ -52,7 +52,7 @@ Object {
   });
   test('also returns the docs if required.', async () => {
     await putNewTrk();
-    const allDocs: any = await getFamily(uri('gpx', { gpx: '0' }), {
+    const allDocs: any = await getFamily(uri('gpx', { gpx: '' }), {
       include_docs: true,
     });
     expect(allDocs).toMatchInlineSnapshot(`
@@ -61,8 +61,8 @@ Object {
   "rows": Array [
     Object {
       "doc": Object {
-        "_id": "gpx/0",
-        "_rev": "1-98d42c99fcf471a500b0506a60e77559",
+        "_id": "gpx/1970-01-01T00%3A00%3A00.000Z",
+        "_rev": "1-649694b1e46839ec63d2a93f483dd023",
         "doc": Object {
           "$": Object {
             "creator": "dyomedea version 0.000002",
@@ -81,25 +81,25 @@ Object {
         },
         "type": "gpx",
       },
-      "id": "gpx/0",
-      "key": "gpx/0",
+      "id": "gpx/1970-01-01T00%3A00%3A00.000Z",
+      "key": "gpx/1970-01-01T00%3A00%3A00.000Z",
       "value": Object {
-        "rev": "1-98d42c99fcf471a500b0506a60e77559",
+        "rev": "1-649694b1e46839ec63d2a93f483dd023",
       },
     },
     Object {
       "doc": Object {
-        "_id": "gpx/0/2trk/00000",
-        "_rev": "1-1e197ef8965a436730f80cabaaaa6f70",
+        "_id": "gpx/1970-01-01T00%3A00%3A00.000Z/2trk/00000",
+        "_rev": "1-e1e6888ad978a5fcc405a75296604bee",
         "doc": Object {
           "number": 0,
         },
         "type": "trk",
       },
-      "id": "gpx/0/2trk/00000",
-      "key": "gpx/0/2trk/00000",
+      "id": "gpx/1970-01-01T00%3A00%3A00.000Z/2trk/00000",
+      "key": "gpx/1970-01-01T00%3A00%3A00.000Z/2trk/00000",
       "value": Object {
-        "rev": "1-1e197ef8965a436730f80cabaaaa6f70",
+        "rev": "1-e1e6888ad978a5fcc405a75296604bee",
       },
     },
   ],
@@ -109,30 +109,30 @@ Object {
   });
   test('returns three rows after a gpx and a track segment have been inserted.', async () => {
     await putNewTrkseg();
-    const allDocs: any = await getFamily(uri('gpx', { gpx: '0' }));
+    const allDocs: any = await getFamily(uri('gpx', { gpx: '' }));
     expect(allDocs).toMatchInlineSnapshot(`
 Object {
   "offset": 0,
   "rows": Array [
     Object {
-      "id": "gpx/0",
-      "key": "gpx/0",
+      "id": "gpx/1970-01-01T00%3A00%3A00.000Z",
+      "key": "gpx/1970-01-01T00%3A00%3A00.000Z",
       "value": Object {
-        "rev": "1-98d42c99fcf471a500b0506a60e77559",
+        "rev": "1-649694b1e46839ec63d2a93f483dd023",
       },
     },
     Object {
-      "id": "gpx/0/2trk/00000",
-      "key": "gpx/0/2trk/00000",
+      "id": "gpx/1970-01-01T00%3A00%3A00.000Z/2trk/00000",
+      "key": "gpx/1970-01-01T00%3A00%3A00.000Z/2trk/00000",
       "value": Object {
-        "rev": "1-1e197ef8965a436730f80cabaaaa6f70",
+        "rev": "1-e1e6888ad978a5fcc405a75296604bee",
       },
     },
     Object {
-      "id": "gpx/0/2trk/00000/00000",
-      "key": "gpx/0/2trk/00000/00000",
+      "id": "gpx/1970-01-01T00%3A00%3A00.000Z/2trk/00000/00000",
+      "key": "gpx/1970-01-01T00%3A00%3A00.000Z/2trk/00000/00000",
       "value": Object {
-        "rev": "1-33cb714b4d5553cc20fc7a753c63cf51",
+        "rev": "1-9d8fbcd9cb7d2a45d6caf57a2cbee7ca",
       },
     },
   ],
@@ -142,37 +142,37 @@ Object {
   });
   test('returns four rows after a gpx and a track point have been inserted.', async () => {
     await putNewTrkpt();
-    const allDocs: any = await getFamily(uri('gpx', { gpx: '0' }));
+    const allDocs: any = await getFamily(uri('gpx', { gpx: '' }));
     expect(allDocs).toMatchInlineSnapshot(`
 Object {
   "offset": 0,
   "rows": Array [
     Object {
-      "id": "gpx/0",
-      "key": "gpx/0",
+      "id": "gpx/1970-01-01T00%3A00%3A00.000Z",
+      "key": "gpx/1970-01-01T00%3A00%3A00.000Z",
       "value": Object {
-        "rev": "1-98d42c99fcf471a500b0506a60e77559",
+        "rev": "1-649694b1e46839ec63d2a93f483dd023",
       },
     },
     Object {
-      "id": "gpx/0/2trk/00000",
-      "key": "gpx/0/2trk/00000",
+      "id": "gpx/1970-01-01T00%3A00%3A00.000Z/2trk/00000",
+      "key": "gpx/1970-01-01T00%3A00%3A00.000Z/2trk/00000",
       "value": Object {
-        "rev": "1-1e197ef8965a436730f80cabaaaa6f70",
+        "rev": "1-e1e6888ad978a5fcc405a75296604bee",
       },
     },
     Object {
-      "id": "gpx/0/2trk/00000/00000",
-      "key": "gpx/0/2trk/00000/00000",
+      "id": "gpx/1970-01-01T00%3A00%3A00.000Z/2trk/00000/00000",
+      "key": "gpx/1970-01-01T00%3A00%3A00.000Z/2trk/00000/00000",
       "value": Object {
-        "rev": "1-33cb714b4d5553cc20fc7a753c63cf51",
+        "rev": "1-9d8fbcd9cb7d2a45d6caf57a2cbee7ca",
       },
     },
     Object {
-      "id": "gpx/0/2trk/00000/00000/00000",
-      "key": "gpx/0/2trk/00000/00000/00000",
+      "id": "gpx/1970-01-01T00%3A00%3A00.000Z/2trk/00000/00000/00000",
+      "key": "gpx/1970-01-01T00%3A00%3A00.000Z/2trk/00000/00000/00000",
       "value": Object {
-        "rev": "1-c88eea2fc5a5637322a3f3357b49618f",
+        "rev": "1-42b858110cde8bec09e5d34b9e480936",
       },
     },
   ],
@@ -183,23 +183,23 @@ Object {
 
   test('returns two rows after a gpx and a waypoint have been inserted.', async () => {
     await putNewWpt();
-    const allDocs: any = await getFamily(uri('gpx', { gpx: '0' }));
+    const allDocs: any = await getFamily(uri('gpx', { gpx: '' }));
     expect(allDocs).toMatchInlineSnapshot(`
 Object {
   "offset": 0,
   "rows": Array [
     Object {
-      "id": "gpx/0",
-      "key": "gpx/0",
+      "id": "gpx/1970-01-01T00%3A00%3A00.000Z",
+      "key": "gpx/1970-01-01T00%3A00%3A00.000Z",
       "value": Object {
-        "rev": "1-98d42c99fcf471a500b0506a60e77559",
+        "rev": "1-649694b1e46839ec63d2a93f483dd023",
       },
     },
     Object {
-      "id": "gpx/0/0wpt/00000",
-      "key": "gpx/0/0wpt/00000",
+      "id": "gpx/1970-01-01T00%3A00%3A00.000Z/0wpt/00000",
+      "key": "gpx/1970-01-01T00%3A00%3A00.000Z/0wpt/00000",
       "value": Object {
-        "rev": "1-dcdc55abd413b401dba4278510d9c51b",
+        "rev": "1-f98b9048879fc7b97771bf2bafc77e42",
       },
     },
   ],
@@ -210,23 +210,23 @@ Object {
 
   test('returns two rows after a gpx and a route have been inserted.', async () => {
     await putNewRte();
-    const allDocs: any = await getFamily(uri('gpx', { gpx: '0' }));
+    const allDocs: any = await getFamily(uri('gpx', { gpx: '' }));
     expect(allDocs).toMatchInlineSnapshot(`
 Object {
   "offset": 0,
   "rows": Array [
     Object {
-      "id": "gpx/0",
-      "key": "gpx/0",
+      "id": "gpx/1970-01-01T00%3A00%3A00.000Z",
+      "key": "gpx/1970-01-01T00%3A00%3A00.000Z",
       "value": Object {
-        "rev": "1-98d42c99fcf471a500b0506a60e77559",
+        "rev": "1-649694b1e46839ec63d2a93f483dd023",
       },
     },
     Object {
-      "id": "gpx/0/1rte/00000",
-      "key": "gpx/0/1rte/00000",
+      "id": "gpx/1970-01-01T00%3A00%3A00.000Z/1rte/00000",
+      "key": "gpx/1970-01-01T00%3A00%3A00.000Z/1rte/00000",
       "value": Object {
-        "rev": "1-bce69fd9ada837c19cf8c1c296f82f92",
+        "rev": "1-f17cd2939d1e63764478613f54835884",
       },
     },
   ],
@@ -237,30 +237,30 @@ Object {
 
   test('returns three rows after a gpx and a route point have been inserted.', async () => {
     await putNewRtept();
-    const allDocs: any = await getFamily(uri('gpx', { gpx: '0' }));
+    const allDocs: any = await getFamily(uri('gpx', { gpx: '' }));
     expect(allDocs).toMatchInlineSnapshot(`
 Object {
   "offset": 0,
   "rows": Array [
     Object {
-      "id": "gpx/0",
-      "key": "gpx/0",
+      "id": "gpx/1970-01-01T00%3A00%3A00.000Z",
+      "key": "gpx/1970-01-01T00%3A00%3A00.000Z",
       "value": Object {
-        "rev": "1-98d42c99fcf471a500b0506a60e77559",
+        "rev": "1-649694b1e46839ec63d2a93f483dd023",
       },
     },
     Object {
-      "id": "gpx/0/1rte/00000",
-      "key": "gpx/0/1rte/00000",
+      "id": "gpx/1970-01-01T00%3A00%3A00.000Z/1rte/00000",
+      "key": "gpx/1970-01-01T00%3A00%3A00.000Z/1rte/00000",
       "value": Object {
-        "rev": "1-bce69fd9ada837c19cf8c1c296f82f92",
+        "rev": "1-f17cd2939d1e63764478613f54835884",
       },
     },
     Object {
-      "id": "gpx/0/1rte/00000/00000",
-      "key": "gpx/0/1rte/00000/00000",
+      "id": "gpx/1970-01-01T00%3A00%3A00.000Z/1rte/00000/00000",
+      "key": "gpx/1970-01-01T00%3A00%3A00.000Z/1rte/00000/00000",
       "value": Object {
-        "rev": "1-1045e2dc6d2f7927514b02f79d14daa8",
+        "rev": "1-ba3f25be70b620dd06b453ec29853bae",
       },
     },
   ],
diff --git a/src/db/rte.test.ts b/src/db/rte.test.ts
index f8a7a70..97d30cb 100644
--- a/src/db/rte.test.ts
+++ b/src/db/rte.test.ts
@@ -43,6 +43,6 @@ describe('The rte module', () => {
   });
   test('db.put() generates ids for both gpx and trk if needed', async () => {
     const id = await putNewRte();
-    expect(id).toEqual({ gpx: '0', rte: '00000' });
+    expect(id).toEqual({ gpx: '1970-01-01T00:00:00.000Z', rte: '00000' });
   });
 });
diff --git a/src/db/rtept.test.ts b/src/db/rtept.test.ts
index 68c8e03..6ce9a04 100644
--- a/src/db/rtept.test.ts
+++ b/src/db/rtept.test.ts
@@ -53,6 +53,6 @@ describe('The rtept module', () => {
   });
   test('db.put() generates ids for both gpx and rte if needed', async () => {
     const id = await putNewRtept();
-    expect(id).toEqual({ gpx: '0', rte: '00000', rtept: '00000' });
+    expect(id).toEqual({ gpx: '1970-01-01T00:00:00.000Z', rte: '00000', rtept: '00000' });
   });
 });
diff --git a/src/db/trk.test.ts b/src/db/trk.test.ts
index 917eb39..f29fdb6 100644
--- a/src/db/trk.test.ts
+++ b/src/db/trk.test.ts
@@ -42,6 +42,6 @@ describe('The trk module', () => {
   });
   test('db.put() generates ids for both gpx and trk if needed', async () => {
     const id = await putNewTrk();
-    expect(id).toEqual({ gpx: '0', trk: '00000' });
+    expect(id).toEqual({ gpx: '1970-01-01T00:00:00.000Z', trk: '00000' });
   });
 });
diff --git a/src/db/trkpt.test.ts b/src/db/trkpt.test.ts
index ab7db77..f2097ce 100644
--- a/src/db/trkpt.test.ts
+++ b/src/db/trkpt.test.ts
@@ -70,7 +70,7 @@ describe('The trkpt module', () => {
   test('db.put() generates ids for both gpx and trk if needed', async () => {
     const id = await putNewTrkpt();
     expect(id).toEqual({
-      gpx: '0',
+      gpx: '1970-01-01T00:00:00.000Z',
       trk: '00000',
       trkseg: '00000',
       trkpt: '00000',
diff --git a/src/db/trkseg.test.ts b/src/db/trkseg.test.ts
index 715a3a3..da26cb2 100644
--- a/src/db/trkseg.test.ts
+++ b/src/db/trkseg.test.ts
@@ -35,6 +35,6 @@ describe('The trkseg module', () => {
   });
   test('db.put() generates ids for both gpx and trk if needed', async () => {
     const id = await putNewTrkseg();
-    expect(id).toEqual({ gpx: '0', trk: '00000', trkseg: '00000' });
+    expect(id).toEqual({ gpx: '1970-01-01T00:00:00.000Z', trk: '00000', trkseg: '00000' });
   });
 });
diff --git a/src/db/wpt.test.ts b/src/db/wpt.test.ts
index 6b8dc0a..812a0c2 100644
--- a/src/db/wpt.test.ts
+++ b/src/db/wpt.test.ts
@@ -53,6 +53,6 @@ describe('The wpt module', () => {
   });
   test('db.put() generates ids for both gpx and trk if needed', async () => {
     const id = await putNewWpt();
-    expect(id).toEqual({ gpx: '0', wpt: '00000' });
+    expect(id).toEqual({ gpx: '1970-01-01T00:00:00.000Z', wpt: '00000' });
   });
 });