feat: use difference_posting_date for journal entry posting_date

(cherry picked from commit ff1d040)

Author: rs-rethik

erpnext/controllers/accounts_controller.py

@@ -1204,6 +1204,7 @@ def set_advances(self):
 				"advance_amount": flt(d.amount),
 				"allocated_amount": allocated_amount,
 				"ref_exchange_rate": flt(d.exchange_rate),  # exchange_rate of advance entry
+				"difference_posting_date": self.posting_date,
 			}
 			if d.get("paid_from"):
 				advance_row["account"] = d.paid_from
@@ -1509,7 +1510,6 @@ def make_exchange_gain_loss_journal(
 						gain_loss_account = frappe.get_cached_value(
 							"Company", self.company, "exchange_gain_loss_account"
 						)
-
 						je = create_gain_loss_journal(
 							self.company,
 							args.get("difference_posting_date") if args else self.posting_date,
@@ -1595,6 +1595,7 @@ def update_against_document_in_jv(self):
 							"Company", self.company, "exchange_gain_loss_account"
 						),
 						"exchange_gain_loss": flt(d.get("exchange_gain_loss")),
+						"difference_posting_date": d.get("difference_posting_date"),
 					}
 				)
 				lst.append(args)