diff --git a/disk/src/binned.rs b/disk/src/binned.rs
index 25fe6de..917a683 100644
--- a/disk/src/binned.rs
+++ b/disk/src/binned.rs
@@ -979,7 +979,9 @@ impl<NTY> MinMaxAvgBinsCollected<NTY> {
 
 #[derive(Serialize)]
 pub struct MinMaxAvgBinsCollectedResult<NTY> {
-    ts_bin_edges: Vec<IsoDateTime>,
+    ts0: u64,
+    tsoff: Vec<u64>,
+    //ts_bin_edges: Vec<IsoDateTime>,
     counts: Vec<u64>,
     mins: Vec<Option<NTY>>,
     maxs: Vec<Option<NTY>>,
@@ -989,7 +991,8 @@ pub struct MinMaxAvgBinsCollectedResult<NTY> {
     #[serde(skip_serializing_if = "Zero::is_zero", rename = "missingBins")]
     missing_bins: u32,
     #[serde(skip_serializing_if = "Option::is_none", rename = "continueAt")]
-    continue_at: Option<IsoDateTime>,
+    //continue_at: Option<IsoDateTime>,
+    continue_at: Option<u64>,
 }
 
 pub struct MinMaxAvgBinsCollector<NTY> {
@@ -1041,19 +1044,19 @@ where
     }
 
     fn result(self) -> Result<Self::Output, Error> {
+        let ts0 = self.vals.ts1s.first().map_or(0, |k| *k / SEC);
         let bin_count = self.vals.ts1s.len() as u32;
-        let mut tsa: Vec<_> = self
-            .vals
-            .ts1s
+        let mut tsoff: Vec<_> = self.vals.ts1s.iter().map(|k| *k - ts0 * SEC).collect();
+        if let Some(&k) = self.vals.ts2s.last() {
+            tsoff.push(k - ts0 * SEC);
+        }
+        let tsoff = tsoff;
+        let _iso: Vec<_> = tsoff
             .iter()
             .map(|&k| IsoDateTime(Utc.timestamp_nanos(k as i64)))
             .collect();
-        if let Some(&z) = self.vals.ts2s.last() {
-            tsa.push(IsoDateTime(Utc.timestamp_nanos(z as i64)));
-        }
-        let tsa = tsa;
         let continue_at = if self.vals.ts1s.len() < self.bin_count_exp as usize {
-            match tsa.last() {
+            match tsoff.last() {
                 Some(k) => Some(k.clone()),
                 None => Err(Error::with_msg("partial_content but no bin in result"))?,
             }
@@ -1061,7 +1064,8 @@ where
             None
         };
         let ret = MinMaxAvgBinsCollectedResult::<NTY> {
-            ts_bin_edges: tsa,
+            ts0,
+            tsoff,
             counts: self.vals.counts,
             mins: self.vals.mins,
             maxs: self.vals.maxs,
diff --git a/httpret/static/documentation/api4.html b/httpret/static/documentation/api4.html
index 96d4ee9..e0da2fb 100644
--- a/httpret/static/documentation/api4.html
+++ b/httpret/static/documentation/api4.html
@@ -95,13 +95,14 @@ curl -H 'Accept: application/json' 'https://data-api.psi.ch/api/4/search/channel
 
 <h4>CURL example:</h4>
 <pre>
-curl -H 'Accept: application/json' 'https://data-api.psi.ch/api/4/events?channelBackend=sf-databuffer&channelName=SLAAR-LSCP4-LAS6891:CH7:1&begDate=2021-06-11T07:00:00.000Z&endDate=2021-06-11T07:00:01.000Z'
+curl -H 'Accept: application/json' 'https://data-api.psi.ch/api/4/events?channelBackend=sf-databuffer
+  &channelName=SLAAR-LSCP4-LAS6891:CH7:1&begDate=2021-06-11T07:00:00.000Z&endDate=2021-06-11T07:00:01.000Z'
 </pre>
 
 <h4>Timestamp format</h4>
 <p>Javascript can not represent the full 64-bit integer and the databuffer nanosecond timestamps would lose precision.
 Therefore, timestamps are represented in the response by <strong>ts0</strong> which gives an absolute anchor
-in time in units of seconds, and the array <strong>tsoff</strong> with the offset of each event in microseconds.</p>
+in time in units of seconds, and the array <strong>tsoff</strong> with the offset of each event in nanoseconds.</p>
 
 <h4>Timeout</h4>
 <p>If the requested range takes too long to retrieve, then the flags <strong>timedOut: true</strong> will be set.</p>
@@ -128,9 +129,6 @@ in time in units of seconds, and the array <strong>tsoff</strong> with the offse
 }
 </pre>
 
-<h4>Complete result</h4>
-<p>If the result does not contain a <strong>continueAt</strong> key then the result is complete.</p>
-
 <h4>Finalised range</h4>
 <p>If the server can determine that no more data will be added to the requested time range
     then it will add the flag <strong>finalisedRange: true</strong> to the response.</p>
@@ -169,38 +167,79 @@ as new bins are received.</p>
 <p>Example response:</p>
 <pre>
 {
-  "continueAt": "2021-05-25T16:00:00.000Z",
-  "missingBins": 2,
+  "ts0": 1623304800,
+  "missingBins": 1,
+  "continueAt": 86400000000000,
+  "tsoff": [
+    0,
+    7200000000000,
+    14400000000000,
+    21600000000000,
+    28800000000000,
+    36000000000000,
+    43200000000000,
+    50400000000000,
+    57600000000000,
+    64800000000000,
+    72000000000000,
+    79200000000000,
+    86400000000000
+  ],
   "avgs": [
-    340.87640380859375,
-    340.7442321777344,
-    340.58685302734375,
-    341.04608154296875
+    341.3874206542969,
+    341.5171203613281,
+    341.70989990234375,
+    341.2113952636719,
+    341.84088134765625,
+    342.1435546875,
+    341.16558837890625,
+    342.2756652832031,
+    342.9447326660156,
+    343.0351867675781,
+    342.6963195800781,
+    342.054931640625
   ],
   "counts": [
-    143076,
-    143077,
-    143076,
-    143076
+    71539,
+    71537,
+    71538,
+    71539,
+    71538,
+    71537,
+    71538,
+    71539,
+    71539,
+    71539,
+    71538,
+    71299
   ],
   "maxs": [
+    450,
+    450,
+    462,
+    458,
+    454,
+    450,
     452,
-    452,
-    459,
-    458
+    451,
+    450,
+    453,
+    464,
+    448
   ],
   "mins": [
-    231,
-    240,
+    224,
     239,
-    239
-  ],
-  "tsBinEdges": [
-    "2021-05-25T00:00:00.000Z",
-    "2021-05-25T04:00:00.000Z",
-    "2021-05-25T08:00:00.000Z",
-    "2021-05-25T12:00:00.000Z",
-    "2021-05-25T16:00:00.000Z"
+    242,
+    235,
+    243,
+    239,
+    239,
+    241,
+    243,
+    229,
+    244,
+    225
   ]
 }
 </pre>