feat: expose function to convert dates

src/index.ts

@@ -1,4 +1,4 @@
 export * from './hooks'
 export * as constants from './constants'
 export * from './period-calculation'
-export { getNowInCalendar, validateDateString } from './utils'
+export { getNowInCalendar, validateDateString, convertDate } from './utils'

src/utils/convert-date.ts

@@ -0,0 +1,15 @@
+import { Temporal } from '@js-temporal/polyfill'
+import { NepaliCalendar } from '../custom-calendars/nepaliCalendar'
+import { SupportedCalendar } from '../types'
+
+type ConvertDateFn = (
+    date: string | Temporal.PlainDate,
+    calendar: SupportedCalendar
+) => Temporal.PlainDate
+
+export const convertDate: ConvertDateFn = (date, calendar) => {
+    if (calendar === 'nepali') {
+        return Temporal.PlainDate.from(date).withCalendar(new NepaliCalendar())
+    }
+    return Temporal.PlainDate.from(date).withCalendar(calendar)
+}

src/utils/index.ts

@@ -4,3 +4,5 @@ export { default as getNowInCalendar } from './getNowInCalendar'
 export * from './helpers'
 export { default as localisationHelpers } from './localisationHelpers'
 export { validateDateString } from './validate-date-string'
+
+export { convertDate } from './convert-date'