[CIAB Bookings] Update logic of tabs filtering

WooCommerce/src/main/kotlin/com/woocommerce/android/ui/bookings/list/BookingListFiltersBuilder.kt

@@ -2,24 +2,34 @@ package com.woocommerce.android.ui.bookings.list
 
 import org.wordpress.android.fluxc.network.rest.wpcom.wc.bookings.BookingsFilterOption
 import java.time.Clock
-import java.time.Instant
+import java.time.LocalDate
 import java.time.LocalTime
-import java.time.ZonedDateTime
+import java.time.ZoneOffset
 import javax.inject.Inject
 
 class BookingListFiltersBuilder @Inject constructor(
     private val clock: Clock
 ) {
+    /**
+     * Returns a [BookingsFilterOption.DateRange] based on the selected [BookingListTab].
+     *
+     * We use UTC for the API calls, as the API stores the dates without timezone information, which means that
+     * when comparing dates, they are treated as UTC times.
+     * See p1759398245019489-slack-C09FHQNQERG
+     */
     fun BookingListTab.asDateRangeFilter(): BookingsFilterOption.DateRange? {
+        fun todayAtMidnight() = LocalDate.now(clock).atTime(LocalTime.MIDNIGHT).atOffset(ZoneOffset.UTC).toInstant()
+        fun todayAtEndOfDay() = LocalDate.now(clock).atTime(LocalTime.MAX).atOffset(ZoneOffset.UTC).toInstant()
+
         return when (this) {
             BookingListTab.Today -> BookingsFilterOption.DateRange(
-                before = ZonedDateTime.now(clock).with(LocalTime.MAX).toInstant(),
-                after = ZonedDateTime.now(clock).with(LocalTime.MIN).toInstant()
+                before = todayAtEndOfDay(),
+                after = todayAtMidnight()
             )
 
             BookingListTab.Upcoming -> BookingsFilterOption.DateRange(
                 before = null,
-                after = Instant.now(clock)
+                after = todayAtEndOfDay()
             )
 
             BookingListTab.All -> null

WooCommerce/src/test/kotlin/com/woocommerce/android/ui/bookings/list/BookingListFilterBuilderTest.kt

@@ -21,8 +21,8 @@ class BookingListFilterBuilderTest {
         }
 
         assertThat(filter).isNotNull()
-        assertThat(filter?.after).isEqualTo(Instant.parse("2025-01-01T00:00:00+02:00"))
-        assertThat(filter?.before).isEqualTo(Instant.parse("2025-01-01T23:59:59.999999999+02:00"))
+        assertThat(filter?.after).isEqualTo(Instant.parse("2025-01-01T00:00:00+00:00"))
+        assertThat(filter?.before).isEqualTo(Instant.parse("2025-01-01T23:59:59.999999999+00:00"))
     }
 
     @Test
@@ -32,7 +32,7 @@ class BookingListFilterBuilderTest {
         }
 
         assertThat(filter).isNotNull()
-        assertThat(filter?.after).isEqualTo(mockedNow)
+        assertThat(filter?.after).isEqualTo(Instant.parse("2025-01-01T23:59:59.999999999+00:00"))
         assertThat(filter?.before).isNull()
     }