diff --git a/.changeset/chilly-bugs-invent.md b/.changeset/chilly-bugs-invent.md
new file mode 100644
index 0000000000..5d57b83352
--- /dev/null
+++ b/.changeset/chilly-bugs-invent.md
@@ -0,0 +1,5 @@
+---
+'@commercetools-uikit/calendar-time-utils': patch
+---
+
+migrate to TypeScript, use Moment Types
diff --git a/packages/calendar-time-utils/index.js b/packages/calendar-time-utils/index.ts
similarity index 100%
rename from packages/calendar-time-utils/index.js
rename to packages/calendar-time-utils/index.ts
diff --git a/packages/calendar-time-utils/src/calendar-time.js b/packages/calendar-time-utils/src/calendar-time.ts
similarity index 55%
rename from packages/calendar-time-utils/src/calendar-time.js
rename to packages/calendar-time-utils/src/calendar-time.ts
index 91f050c134..0820f7b8e9 100644
--- a/packages/calendar-time-utils/src/calendar-time.js
+++ b/packages/calendar-time-utils/src/calendar-time.ts
@@ -2,15 +2,34 @@
 // respects the timezone and uses full iso date strings instead of
 // just YYYY-MM-DD.
 
-import moment from 'moment-timezone';
+import moment, {
+  DurationInputArg1,
+  MomentInput,
+  LocaleSpecifier,
+} from 'moment-timezone';
 import { parseTime } from '@commercetools-uikit/utils';
 
-export const getDaysInMonth = (day, timeZone) =>
+type ParsedTime = {
+  hours: number;
+  minutes: number;
+  seconds: number;
+  milliseconds: number;
+};
+
+export const getDaysInMonth = (day: MomentInput, timeZone: string) =>
   moment.tz(day, timeZone).daysInMonth();
-export const changeDateInMonth = (day, timeZone, dayOfMonth) =>
-  moment.tz(day, timeZone).date(dayOfMonth).toISOString();
 
-export const changeTime = (dateString, timeZone, parsedTime) => {
+export const changeDateInMonth = (
+  day: MomentInput,
+  timeZone: string,
+  dayOfMonth: number
+) => moment.tz(day, timeZone).date(dayOfMonth).toISOString();
+
+export const changeTime = (
+  dateString: string,
+  timeZone: string,
+  parsedTime: ParsedTime
+) => {
   const date = moment.tz(dateString, timeZone);
   date.hours(parsedTime.hours);
   date.minutes(parsedTime.minutes);
@@ -20,64 +39,85 @@ export const changeTime = (dateString, timeZone, parsedTime) => {
   return date.toISOString();
 };
 
-export const getPreviousDay = (day) =>
+export const getPreviousDay = (day: MomentInput) =>
   moment(day).subtract(1, 'day').format('YYYY-MM-DD');
 
-export const formatTime = (day, locale, timeZone) => {
+export const formatTime = (
+  day: MomentInput,
+  locale: LocaleSpecifier,
+  timeZone: string
+) => {
   const date = moment.tz(day, timeZone).locale(locale);
   if (date.milliseconds()) return date.format('HH:mm:ss.SSS');
   if (date.seconds()) return date.format('LTS'); // 5:13:51 PM
   return date.format('LT'); // 5:13 PM
 };
 
-export const formatDate = (day, locale, timeZone) => {
+export const formatDate = (
+  day: MomentInput,
+  locale: string,
+  timeZone: string
+) => {
   const date = moment(day, moment.ISO_8601, locale).tz(timeZone).format('L');
   const time = formatTime(day, locale, timeZone);
   return `${date} ${time}`;
 };
 
-export const getDateInMonth = (day, timeZone) =>
+export const getDateInMonth = (day: MomentInput, timeZone: string): number =>
   moment.tz(day, timeZone).date();
 
-export const getToday = (timeZone) =>
+export const getToday = (timeZone: string) =>
   moment.tz(timeZone).startOf('day').toISOString();
 
-export const changeMonth = (day, timeZone, delta) =>
-  moment.tz(day, timeZone).add(delta, 'month').toISOString();
-
-export const getPaddingDayCount = (day, locale, timeZone) => {
+export const changeMonth = (
+  day: MomentInput,
+  timeZone: string,
+  delta: DurationInputArg1
+) => moment.tz(day, timeZone).add(delta, 'month').toISOString();
+
+export const getPaddingDayCount = (
+  day: MomentInput,
+  locale: string,
+  timeZone: string
+) => {
   const firstDayOfWeek = moment.localeData(locale).firstDayOfWeek();
-  const firstDayOfMonth = moment
-    .tz(day, timeZone)
-    // .tz(timeZone)
-    .startOf('month')
-    .day();
+  const firstDayOfMonth = moment.tz(day, timeZone).startOf('month').day();
 
   // ensure number is always positive
   return (firstDayOfMonth - firstDayOfWeek + 7) % 7;
 };
 
-export const getWeekdayNames = (locale) => {
+export const getWeekdayNames = (locale: string) => {
   const weekDays = moment.localeData(locale).weekdaysMin();
   const firstDay = moment.localeData(locale).firstDayOfWeek();
   return [...weekDays.slice(firstDay), ...weekDays.slice(0, firstDay)];
 };
 
-export const getStartOf = (day, timeZone) =>
+export const getStartOf = (day: MomentInput, timeZone: string) =>
   moment.tz(day, timeZone).startOf('day').toISOString();
 
-export const getMonthCalendarLabel = (day, locale) =>
+export const getMonthCalendarLabel = (day: MomentInput, locale: string) =>
   moment(day, moment.ISO_8601, locale).format('MMMM');
-export const getYearCalendarLabel = (day, locale) =>
+export const getYearCalendarLabel = (day: MomentInput, locale: string) =>
   moment(day, moment.ISO_8601, locale).format('YYYY');
-export const isSameDay = (a, b) => moment(a).isSame(b, 'day');
-export const getCalendarDayLabel = (day, timeZone) =>
+export const isSameDay = (a: MomentInput, b: MomentInput) =>
+  moment(a).isSame(b, 'day');
+export const getCalendarDayLabel = (day: MomentInput, timeZone: string) =>
   moment.tz(day, timeZone).format('D');
 
-export const createItemDateTimeToString = (locale, timeZone) => (item) =>
-  item ? formatDate(item, locale, timeZone) : '';
-
-export const createCalendarItems = (day, timeString, intl, timeZone) => {
+export const createItemDateTimeToString = (
+  locale: string,
+  timeZone: string
+) => (item: string) => (item ? formatDate(item, locale, timeZone) : '');
+
+export const createCalendarItems = (
+  day: MomentInput,
+  timeString: string,
+  // @deprecated
+  // @ts-ignore
+  intl,
+  timeZone: string
+) => {
   const parsedTime = parseTime(timeString);
 
   return Array.from({ length: getDaysInMonth(day, timeZone) }).map((_, i) => {
@@ -90,12 +130,16 @@ export const createCalendarItems = (day, timeString, intl, timeZone) => {
   });
 };
 
-export const createSuggestedItems = (inputValue, timeZone) => {
+export const createSuggestedItems = (inputValue: string, timeZone: string) => {
   if (inputValue.startsWith('t')) return [getToday(timeZone)];
   return [];
 };
 
-export const parseInputText = (text, locale, timeZone) => {
+export const parseInputText = (
+  text: string,
+  locale: string,
+  timeZone: string
+) => {
   const parts = text.split(' ');
   const dateString = parts[0];
   const timeString = parts.slice(1).join(' ');
diff --git a/packages/calendar-time-utils/src/index.js b/packages/calendar-time-utils/src/index.ts
similarity index 100%
rename from packages/calendar-time-utils/src/index.js
rename to packages/calendar-time-utils/src/index.ts
diff --git a/packages/calendar-time-utils/src/version.js b/packages/calendar-time-utils/src/version.ts
similarity index 100%
rename from packages/calendar-time-utils/src/version.js
rename to packages/calendar-time-utils/src/version.ts