diff --git a/src/common/dayjs.ts b/src/common/dayjs.ts
index 7e0f70d..3a8a6cd 100644
--- a/src/common/dayjs.ts
+++ b/src/common/dayjs.ts
@@ -1,5 +1,6 @@
 import 'dayjs/locale/nl'
 
+import { TransformationType, TransformFnParams } from 'class-transformer'
 import * as dayjs from 'dayjs'
 import * as customParseFormat from 'dayjs/plugin/customParseFormat'
 import * as isSameOrBefore from 'dayjs/plugin/isSameOrBefore'
@@ -41,4 +42,20 @@ const dayjsTz = (
 	return dayjs(date, format).tz('Europe/Amsterdam')
 }
 
+export const DayjsTransformer = ({ value, type }: TransformFnParams) => {
+	switch (type) {
+		case TransformationType.PLAIN_TO_CLASS:
+			return dayjs(value)
+		case TransformationType.CLASS_TO_PLAIN:
+			return value.format()
+		default:
+			return value
+	}
+}
+
+export const DayjsColumnTransformer = {
+	to: (value: dayjs.Dayjs) => value.format(),
+	from: (value: Date) => dayjs(value),
+}
+
 export default dayjsTz
diff --git a/src/reservations/entity.ts b/src/reservations/entity.ts
index f585dfa..1948fe4 100644
--- a/src/reservations/entity.ts
+++ b/src/reservations/entity.ts
@@ -1,9 +1,11 @@
 import { Exclude, Transform, Type } from 'class-transformer'
-import { TransformationType } from 'class-transformer'
 import { Dayjs } from 'dayjs'
 import { Column, Entity, PrimaryGeneratedColumn } from 'typeorm'
 
-import dayjs from '../common/dayjs'
+import dayjs, {
+	DayjsColumnTransformer,
+	DayjsTransformer,
+} from '../common/dayjs'
 
 export interface Opponent {
 	id: string
@@ -20,42 +22,18 @@ export class Reservation {
 
 	@Column('datetime', {
 		nullable: false,
-		transformer: {
-			to: (value: Dayjs) => value.format(),
-			from: (value: Date) => dayjs(value),
-		},
+		transformer: DayjsColumnTransformer,
 	})
 	@Type(() => Dayjs)
-	@Transform(({ value, type }) => {
-		switch (type) {
-			case TransformationType.PLAIN_TO_CLASS:
-				return dayjs(value)
-			case TransformationType.CLASS_TO_PLAIN:
-				return value.format()
-			default:
-				return value
-		}
-	})
+	@Transform(DayjsTransformer)
 	dateRangeStart: Dayjs
 
 	@Column('datetime', {
 		nullable: false,
-		transformer: {
-			to: (value: Dayjs) => value.format(),
-			from: (value: Date) => dayjs(value),
-		},
+		transformer: DayjsColumnTransformer,
 	})
 	@Type(() => Dayjs)
-	@Transform(({ value, type }) => {
-		switch (type) {
-			case TransformationType.PLAIN_TO_CLASS:
-				return dayjs(value)
-			case TransformationType.CLASS_TO_PLAIN:
-				return value.format()
-			default:
-				return value
-		}
-	})
+	@Transform(DayjsTransformer)
 	dateRangeEnd: Dayjs
 
 	@Column('json', { nullable: false })