提交

web-admin/src/utils/protocol-payment-installment.ts

@@ -13,6 +13,34 @@ export function addMonthsYmd(dateStr: string, months: number): string {
   return `${yy}${mm}${dd}`
 }
 
+/** 日期加 N 天，返回 YYYYMMDD（入参支持 YYYYMMDD 或 YYYY-MM-DD） */
+export function addDaysYmd(dateStr: string, days: number): string {
+  const compact = String(dateStr || '').replace(/-/g, '')
+  if (compact.length !== 8) return ''
+  const y = parseInt(compact.slice(0, 4), 10)
+  const m = parseInt(compact.slice(4, 6), 10) - 1
+  const d = parseInt(compact.slice(6, 8), 10)
+  const date = new Date(y, m, d)
+  date.setDate(date.getDate() + days)
+  const yy = date.getFullYear()
+  const mm = String(date.getMonth() + 1).padStart(2, '0')
+  const dd = String(date.getDate()).padStart(2, '0')
+  return `${yy}${mm}${dd}`
+}
+
+/** 分期应缴费时间：第 1 期=开始时间，第 2 期起在按月递增基础上提前 10 天 */
+export function calcFqInstallmentDueDate(
+  startDate: string,
+  index: number,
+  intervalMonths: number
+): string {
+  const base = addMonthsYmd(startDate, index * intervalMonths)
+  if (index >= 1) {
+    return addDaysYmd(base, -10)
+  }
+  return base
+}
+
 export function calcInstallmentDueAmounts(
   contractAmount: number | null | undefined,
   count: number
@@ -87,14 +115,15 @@ export function alignFqPaymentDetailsForDisplay(
     if (i < unnumbered.length) {
       const raw = { ...unnumbered[i], installmentNo: no }
       if (!raw.installmentDueDate && startDate && interval) {
-        raw.installmentDueDate = addMonthsYmd(startDate, i * interval)
+        raw.installmentDueDate = calcFqInstallmentDueDate(startDate, i, interval)
       }
       result.push(raw)
       continue
     }
     result.push({
       installmentNo: no,
-      installmentDueDate: startDate && interval ? addMonthsYmd(startDate, i * interval) : '',
+      installmentDueDate:
+        startDate && interval ? calcFqInstallmentDueDate(startDate, i, interval) : '',
       dueAmount: amounts[i] ?? null,
       payStatus: 'dfj',
       transferType: '',