[minor] set set_posting_time to 1 while data import (#8835)

diff --git a/erpnext/utilities/transaction_base.py b/erpnext/utilities/transaction_base.py
index 9a25b76..7657188 100644
--- a/erpnext/utilities/transaction_base.py
+++ b/erpnext/utilities/transaction_base.py
@@ -18,6 +18,10 @@
 				frappe.db.get_value("Notification Control", None, dt + "_message"))
 
 	def validate_posting_time(self):
+		# set Edit Posting Date and Time to 1 while data import
+		if frappe.flags.in_import:
+			self.set_posting_time = 1
+
 		if not getattr(self, 'set_posting_time', None):
 			now = now_datetime()
 			self.posting_date = now.strftime('%Y-%m-%d')