Fix timestamp regression

src/main/scala/com.snowplowanalytics.snowplow.micro/Routing.scala

@@ -188,12 +188,6 @@ object Routing {
   implicit val dateTimeEncoder: Encoder[DateTime] =
     Encoder[String].contramap(_.toString)
 
-  implicit val instantEncoder: Encoder[Instant] =
-    Encoder[Long].contramap(_.toEpochMilli)
-
-  implicit val instantDecoder: Decoder[Instant] =
-    Decoder[Long].map(Instant.ofEpochMilli)
-
   implicit val nameValuePairEncoder: Encoder[NameValuePair] =
     Encoder[String].contramap(kv => s"${kv.getName}=${kv.getValue}")
 

ui/src/App.tsx

@@ -131,22 +131,22 @@ function App() {
       // only filter by selected bucket, or not at all
       timeRange = selectedTimeBucket
         ? {
-            start: Number(selectedTimeBucket.split('-')[0]),
-            end: Number(selectedTimeBucket.split('-')[1]),
+            start: selectedTimeBucket.split('|')[0],
+            end: selectedTimeBucket.split('|')[1],
           }
         : undefined
     } else {
       // add a (non-inclusive) upper bound to avoid getting newer events in the results
-      const refreshTimeLimit = lastRefreshTime?.getTime()
-      if (selectedTimeBucket && refreshTimeLimit) {
-        const bucketStart = Number(selectedTimeBucket.split('-')[0])
-        const bucketEnd = Number(selectedTimeBucket.split('-')[1])
+      if (selectedTimeBucket && lastRefreshTime) {
+        const bucketStart = selectedTimeBucket.split('|')[0]
+        const bucketEnd = selectedTimeBucket.split('|')[1]
+        const bucketEndTime = new Date(bucketEnd)
         timeRange = {
           start: bucketStart,
-          end: Math.min(bucketEnd, refreshTimeLimit),
+          end: bucketEndTime < lastRefreshTime ? bucketEnd : lastRefreshTime.toISOString(),
         }
-      } else if (refreshTimeLimit) {
-        timeRange = { end: refreshTimeLimit }
+      } else if (lastRefreshTime) {
+        timeRange = { end: lastRefreshTime.toISOString() }
       }
     }
 
@@ -299,8 +299,8 @@ function App() {
     const filters: string[] = []
 
     if (selectedTimeBucket) {
-      const bucketStart = Number(selectedTimeBucket.split('-')[0])
-      const bucketEnd = Number(selectedTimeBucket.split('-')[1])
+      const bucketStart = selectedTimeBucket.split('|')[0]
+      const bucketEnd = selectedTimeBucket.split('|')[1]
       const startDate = new Date(bucketStart)
       const endDate = new Date(bucketEnd)
       filters.push(`Time: ${startDate.toLocaleString()} – ${endDate.toLocaleString()}`)

ui/src/components/EventsChart.tsx

@@ -50,7 +50,7 @@ export function EventsChart({
       // Check if we actually have events at this time point
       if (data.validEvents > 0 || data.failedEvents > 0) {
         // Clicking on a bar with actual data - toggle selection
-        const bucketKey = `${data.bucketStart}-${data.bucketEnd}`
+        const bucketKey = `${data.bucketStart}|${data.bucketEnd}`
         onBucketClick(selectedBucket === bucketKey ? null : bucketKey)
       } else {
         // Clicking on empty area (no events at this time) - reset selection
@@ -64,7 +64,7 @@ export function EventsChart({
 
   const getBarOpacity = (index: number): number => {
     const data = chartData[index]
-    const bucketKey = `${data.bucketStart}-${data.bucketEnd}`
+    const bucketKey = `${data.bucketStart}|${data.bucketEnd}`
     if (selectedBucket === bucketKey) return 1.0
     if (selectedBucket && selectedBucket !== bucketKey) return 0.2
     return 0.8

ui/src/services/api.ts

@@ -4,8 +4,8 @@ export type Event = {
 }
 
 export type TimelineBucket = {
-  start: number
-  end: number
+  start: string  // ISO string
+  end: string    // ISO string
 }
 
 export type TimelineRequest = {
@@ -40,8 +40,8 @@ export type EventsFilter = {
 }
 
 export type TimeRange = {
-  start?: number
-  end?: number
+  start?: string  // ISO string
+  end?: string    // ISO string
 }
 
 export type EventsSorting = {
@@ -205,8 +205,8 @@ export class EventsApiService {
       const bucketStart = alignedTime - i * bucketSizeMs
       const bucketEnd = bucketStart + bucketSizeMs
       buckets.push({
-        start: bucketStart,
-        end: bucketEnd
+        start: new Date(bucketStart).toISOString(),
+        end: new Date(bucketEnd).toISOString()
       })
     }