diff --git a/lib/cutout/CutoutViewModel.ts b/lib/cutout/CutoutViewModel.ts
index d9bcc25..e690326 100644
--- a/lib/cutout/CutoutViewModel.ts
+++ b/lib/cutout/CutoutViewModel.ts
@@ -1,7 +1,7 @@
 import ObservableState from "../async/ObservableState";
 import { extentBy } from "../itertools/accumulate";
 import flatten from "../itertools/flatten";
-import { today } from "../time";
+import { findByDate, today } from "../time";
 import Series, { type Data, type Observation } from "../time/Series";
 import Stat from "../Stat";
 import CutoutIndex from "./CutoutIndex";
@@ -18,7 +18,7 @@ class CutoutViewModel {
     public readonly stats: ObservableState<Stat[]>;
 
     private constructor(series: Series[]) {
-        const [cutout, index] = series.map(series => Series.find(series, today()));
+        const [cutout, index] = series.map(findByDate(today()));
         this.#series = series;
         this.selected = new ObservableState(cutout);
 
@@ -45,7 +45,7 @@ class CutoutViewModel {
     }
 
     public selectDate = (date = today()): void => {
-        const [cutout, index] = this.#series.map(series => Series.find(series, date));
+        const [cutout, index] = this.#series.map(findByDate(date));
 
         this.stats.state = [
             Stat.from("Cutout", cutout.value),
diff --git a/lib/cutout/PrimalViewModel.ts b/lib/cutout/PrimalViewModel.ts
index 70586b9..89d48d6 100644
--- a/lib/cutout/PrimalViewModel.ts
+++ b/lib/cutout/PrimalViewModel.ts
@@ -1,9 +1,8 @@
-import type { UnaryOperator } from "..";
 import ObservableState from "../async/ObservableState";
 import { extentBy } from "../itertools/accumulate";
 import map from "../itertools/map";
 import zip from "../itertools/zip";
-import { today } from "../time";
+import { findByDate, today } from "../time";
 import Series, { type Data } from "../time/Series";
 import Stat from "../Stat";
 import type Cutout from ".";
@@ -13,9 +12,6 @@ interface PrimalStat extends Stat {
     selected: boolean;
 }
 
-const findByDate = (date: Date): UnaryOperator<Series, Data> =>
-    (series: Series) => Series.find(series, date);
-
 class PrimalViewModel {
     public static from = (cutout: Iterable<Cutout>, primal = Primal.Belly): PrimalViewModel =>
         new PrimalViewModel(primal, [
diff --git a/lib/time/index.ts b/lib/time/index.ts
index 1fbef14..f131e32 100644
--- a/lib/time/index.ts
+++ b/lib/time/index.ts
@@ -1,4 +1,6 @@
-import { parse, format } from "date-fns";
+import { format, parse } from "date-fns";
+import type { UnaryOperator } from "..";
+import Series, { type Data } from "./Series";
 
 const dateFormat = "yyyy-MM-dd";
 
@@ -13,4 +15,7 @@ const getDate = (date: string): Date =>
 const formatDate = (date: Date): string =>
     format(date, dateFormat);
 
-export { formatDate, getDate, today };
+const findByDate = (date: Date): UnaryOperator<Series, Data> =>
+    (series: Series) => Series.find(series, date);
+
+export { formatDate, getDate, today, findByDate };