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Sabahat InayatSabahat Inayat 

How to pass Datepicker input value from LWC input to custom field of the object

<template>
<div class="slds-col"> 
            
            <label class="slds-form-element__label slds-no-flex">Posting Date</label>
            <lightning-input type="date" 
                        name="Postingdate" 
                        value={PostingDate}
                        onchange={PostingDateChange}
            >
            </lightning-input>  
         
        </div>     
</template>

CR.html 
import { LightningElement,api ,track} from 'lwc';

import getInvoiceData from '@salesforce/apex/CustomerRefundLwcController.getInvoiceData';
import getBankAccounts from '@salesforce/apex/CustomerRefundLwcController.getBankAccounts';
import processCustomerRefund from '@salesforce/apex/CustomerRefundLwcController.processCustomerRefund';

export default class CustomerRefund extends LightningElement {
    @api recordId; /*Sales Credit Id*/
    @track invoiceData;
    @track invoiceLinesData;
    @api headerText;
    @api recordProcessing;
    @api bankAccounts = new Array();
    @track selectedBankId;
    @track allocateToSalesCredit;
    @track referenceDetail;
    @track bShowModal = false;
    @track PostingDate;
    /*Toast Event Variables*/
    @api isError = false;
    @api iswarning = false;
    @api issuccess = false;
    @api ToastMessage;


 PostingDateChange(event)
    {
        this.PostingDate = event.target.value;
        this.invoiceData.PostingDate = this.PostingDate;
    }

processRefundHandler() {
        this.recordProcessing = true;
        //console.log('this.formData----'+JSON.stringify(this.invoiceLinesData));
        console.log('this.formData----'+JSON.stringify(this.invoiceData));
        processCustomerRefund({ lstInvoiceLines : this.invoiceLinesData, bankId : this.selectedBankId, allocateToSalesCredit : this.allocateToSalesCredit, reference : this.referenceDetail, postingdate : this.PostingDate })
        .then(result => {
            var responseMessage = result;
            this.recordProcessing = false;
            
            this.ToastMessage = responseMessage;
            if(responseMessage == "Success"){
                //this.issuccess = true;
                this.isError = false;
                this.ToastMessage = "Your Bank Customer Refund has been created";
                this.bShowModal = true;
            }else{
                this.isError = true;
            }
        })
        .catch(error => {
            this.isError = true;
            this.ToastMessage = error ;
            console.log(error);
        });
    }

CR.js
public with sharing class CustomerRefundLwcController {
    public CustomerRefundLwcController() {

    }
 @AuraEnabled
    public static string processCustomerRefund(List<ScLineWrapper> lstInvoiceLines,string bankId,boolean allocateToSalesCredit,string reference){
        system.debug('start update');
        string successMessage = 'Success';
        string responseMessage = 'Success';
        Savepoint spTran = database.setSavePoint();
        try{
            List<Sales_Invoice_Line_Item__c> lstLinesToUpdate = new List<Sales_Invoice_Line_Item__c>();
            decimal amount=0;
            Id taxRate;
            Id salesinvoiceid;

            boolean isValid = true;
            boolean allocateToInvoice = allocateToSalesCredit;
            map<id,Sales_Invoice_Line_Item__c> mapOfSelectedLines = new map<id,Sales_Invoice_Line_Item__c>();

            for(ScLineWrapper lineWrapper : lstInvoiceLines){
                system.debug('isselect>> ' + lineWrapper.isSelected);
                if(lineWrapper.isSelected){
                    salesinvoiceid = lineWrapper.InvoiceLine.Sales_Invoice__c;
                    decimal lineAmount = lineWrapper.InvoiceLine.Foreign_Gross__c;
                    if(lineAmount != null && lineAmount > 0){
                        amount += lineAmount;
                        mapOfSelectedLines.put(lineWrapper.InvoiceLine.id,lineWrapper.InvoiceLine);
                    }

                    if(lineWrapper.InvoiceLine.Tax_Rate__c != null){
                        taxRate = lineWrapper.InvoiceLine.Tax_Rate__c;
                    }
                }
            }

            if(salesinvoiceid == null){
                isValid = false;
                responseMessage = 'Please select at least one sales invoice line';
            }else if(bankId == null){
                isValid = false;
                responseMessage = 'Please select bank account';
            }else if(amount <= 0){
                isValid = false;
                responseMessage = 'Refund amount should be greater than zero';
            }

            system.debug('updatelst>> ' + lstLinesToUpdate);
            //update lstLinesToUpdate;
            if(isValid){
                Sales_Invoice__c siInfo = [select id,Status__c,Account__c,Name from Sales_Invoice__c where id=: salesinvoiceid];
                BankCustomerRefundService objCustomerRefundService = new BankCustomerRefundService();
                BankCustomerRefundService.BankCustomerRefundWrapper objRefundWrapper = new BankCustomerRefundService.BankCustomerRefundWrapper();
                Id accountId = siInfo.Account__c;
                objRefundWrapper.AccountId = accountId;
                objRefundWrapper.PostingDate = Date.Today()+(-216);
                objRefundWrapper.BankAccountId = bankId;
                objRefundWrapper.TaxRate = taxRate;
                objRefundWrapper.Amount = amount;
                objRefundWrapper.Reference = reference;
                BankCustomerRefundService.Response objResponse = objCustomerRefundService.CreateBankCustomerRefund(objRefundWrapper);
                responseMessage = objResponse.ResponseMessage;
    
                if(allocateToInvoice && responseMessage == successMessage){
                    Bank_Payment__c objBankPayment = objResponse.BankPayments.get(accountId);
                    List<Ledger__c> listofLedgers = [Select id,name,Foreign_Gross_Total__c,Type__c
                                                    FROM Ledger__c
                                                    Where Customer_Supplier_Account_Name__c =: accountId AND Show_On_Transaction__c=1
                                                    AND Paid__c = 'N' AND Is_Deleted__c = false
                                                    AND (Sales_Invoice_Line_Item__c IN: mapOfSelectedLines.keyset() OR Bank_Payment__c =: objBankPayment.id) ];
                    
                    if(!listofLedgers.isEmpty()){
                        BankAllocateCreditsAndPaymentsService objAllocateCreditsAndPaymentService = new BankAllocateCreditsAndPaymentsService();
                        BankAllocateCreditsAndPaymentsService.BankAllocateCreditsAndPaymentsWrapper objAllocateCreditWrapper = new BankAllocateCreditsAndPaymentsService.BankAllocateCreditsAndPaymentsWrapper();
                        objAllocateCreditWrapper.AccountId = accountId;
                        objAllocateCreditWrapper.PostingDate = Date.Today()+(-216);
                        List<BankAllocateCreditsAndPaymentsService.BankAllocateCreditsAndPaymentsLineWrapper> BankAllocateCreditsAndPaymentsLines = new List<BankAllocateCreditsAndPaymentsService.BankAllocateCreditsAndPaymentsLineWrapper>();
                        for(Ledger__c ledger : listofLedgers){
                            BankAllocateCreditsAndPaymentsService.BankAllocateCreditsAndPaymentsLineWrapper objPaymentLine = new BankAllocateCreditsAndPaymentsService.BankAllocateCreditsAndPaymentsLineWrapper();
                            objPaymentLine.LedgerName = ledger.Name;
                            objPaymentLine.Amount = ledger.Foreign_Gross_Total__c;
                            BankAllocateCreditsAndPaymentsLines.add(objPaymentLine);
                        }

                        objAllocateCreditWrapper.BankAllocateLines = BankAllocateCreditsAndPaymentsLines;
                        BankAllocateCreditsAndPaymentsService.Response objAllocateResponse = objAllocateCreditsAndPaymentService.BankAllocateCustomerBalance(objAllocateCreditWrapper);
                        responseMessage = objAllocateResponse.ResponseMessage;
                        system.debug('Response>>' + objAllocateResponse.ResponseMessage);
                    }                                                    
                }
                
            }
        }catch(Exception ex){
            responseMessage = ex.getStackTraceString();
        }
        
        if(responseMessage != successMessage){
            Database.rollback(spTran);
        }
        system.debug('Response>>' + responseMessage);
        return responseMessage;
        
    }

CRLWCController.cls

I want to use LWC datepicker input to pass date value in CRLWC.cls in PostingDate variable. 

Can anyone help please