fix: date format

src/extends/date.ts

@@ -0,0 +1,37 @@
+export const format = function format(
+  this: Date,
+  fmt = 'YYYY-MM-DDTHH:mm:ss.SSS'
+) {
+  const options = {
+    'M+': this.getMonth() + 1,
+    'D+': this.getDate(),
+    'H+': this.getHours(),
+    'm+': this.getMinutes(),
+    's+': this.getSeconds(),
+    SSS: this.getMilliseconds()
+  }
+
+  const yearRegexp = /(Y+)/
+  if (yearRegexp.test(fmt)) {
+    fmt = fmt.replace(yearRegexp, match => {
+      return this.getFullYear().toString().slice(-match.length)
+    })
+  }
+
+  for (const [key, value] of Object.entries(options)) {
+    const regexp = new RegExp(`(${key})`)
+    if (regexp.test(fmt)) {
+      fmt = fmt.replace(regexp, match => {
+        return match.length === 1 ? value : value.toString().padStart(2, '0')
+      })
+    }
+  }
+
+  return fmt
+}
+
+export const install = (): void => {
+  Object.assign(Date.prototype, {
+    format
+  })
+}