front: drop addDurationToDate() and subtractDurationFromDate()

This is now unused.

Signed-off-by: Simon Ser <[email protected]>

front/src/utils/date.ts

@@ -1,4 +1,4 @@
-import dayjs, { type ManipulateType } from 'dayjs';
+import dayjs from 'dayjs';
 import 'dayjs/locale/fr';
 import customParseFormat from 'dayjs/plugin/customParseFormat';
 import timezone from 'dayjs/plugin/timezone';
@@ -134,22 +134,6 @@ export function convertUTCDateToLocalDate(date: number) {
   return Math.abs(timeDifferenceMinutes) * 60 + date;
 }
 
-export function addDurationToDate(
-  startTime: Date,
-  duration: number,
-  durationUnit: ManipulateType = 'second'
-): Date {
-  return dayjs(startTime).add(duration, durationUnit).toDate();
-}
-
-export function subtractDurationFromDate(
-  startTime: Date,
-  duration: number,
-  durationUnit: ManipulateType = 'second'
-): Date {
-  return dayjs(startTime).subtract(duration, durationUnit).toDate();
-}
-
 /**
  * Serializes a Date object to a string format 'DD/MM HH:mm:ss' without the year.
  * @param {Date} date - The Date object to be serialized.