feat: add parse string to date

src/items/date.ts

@@ -1,7 +1,32 @@
+import { parceable } from 'Schema'
 import SchemaItem from '../SchemaItem'
 
 export default class SchemaDate extends SchemaItem<Date> {
 
+	@parceable()
+	public parseString(format: 'iso8601' | 'yy-mm-dd' | 'jj/mm/yy' = 'iso8601') {
+		switch (format) {
+			case 'yy-mm-dd':
+			case 'iso8601': {
+				this.addPreProcess((it) => typeof it === 'string' ? new Date(it) : it)
+				break
+			}
+			case 'jj/mm/yy': {
+				this.addPreProcess((input) => {
+					if (typeof input !== 'string') {
+						return input
+					}
+					const splitted = input.split('/').map((it) => Number.parseInt(it, 10))
+					if (splitted.length !== 3) {
+						return input
+					}
+
+					return new Date(splitted[2], splitted[1] - 1, splitted[0])
+				})
+			}
+		}
+	}
+
 	public override isOfType(input: unknown): input is Date {
 		return input instanceof Date
 	}