Angularのコンポーネント内に書いたカスタムバリデータの関数で、クラスの変数を使いたい

前提・実現したいこと

Angularのコンポーネントにカスタムバリデータを定義したのですが、
コンポーネントのフォーム情報を取得したいのですが、方法が分からず手詰まり状態です。
質問がイマイチ謎だと思いますが、指摘していただければと思います。

該当のソースコード

import { Component, OnInit, ViewChild } from '@angular/core';
import { ToDoService } from '../to-do.service';
import { TimeCheckValidatorValueServiceService } from '../time-check-validator-value-service.service';
import { ToDo } from '../todo';
import { CdkTextareaAutosize } from '@angular/cdk/text-field';
import {
    FormGroup,
    FormControl,
    Validators,
    FormGroupDirective,
    NgForm,
    AbstractControl,
} from '@angular/forms';
import { ErrorStateMatcher } from '@angular/material/core';
import { from } from 'rxjs';

@Component({
    selector: 'app-to-do',
    templateUrl: './to-do.component.html',
    styleUrls: ['./to-do.component.scss'],
})
export class ToDoComponent implements OnInit {
    ToDos: ToDo[];
    selectedToDo: ToDo;
    btnStr: string;
    day;
    time;
    loginForm: FormGroup;
    minDate: Date;
    creationTime;
    minTime: string;

    constructor(
        private todoService: ToDoService,
        private timeCheckValidatorValueService: TimeCheckValidatorValueServiceService
    ) {}

    @ViewChild('autosize') autosize: CdkTextareaAutosize;

    ngOnInit(): void {
        this.minDate = new Date();
        this.getToDo();
        this.creationTime = this.minDate.getTime();
        this.loginForm = new FormGroup({
            nameControl: new FormControl('', [
                Validators.maxLength(15),
                Validators.required,
            ]),
            dateControl: new FormControl('', [Validators.required]),
            timeControl: new FormControl('', [
                Validators.required,
                timeCheckValidator,
            ]),
            contentControl: new FormControl('', [
                Validators.required,
                Validators.maxLength(300),
            ]),
        });
        this.timeCheckValidatorValueService.time = this.loginForm.controls[
            'dateControl'
        ].value;
    }
    get nameControl() {
        return this.loginForm.get('nameControl') as FormControl;
    }
    get dateControl() {
        return this.loginForm.get('dateControl') as FormControl;
    }
    get timeControl() {
        return this.loginForm.get('timeControl') as FormControl;
    }
    get contentControl() {
        return this.loginForm.get('contentControl') as FormControl;
    }

    getToDo(): void {
        this.todoService.getToDo().subscribe((ToDos) => (this.ToDos = ToDos));
    }

    onSubmit(): void {
        
    }

    onSelect(todo: ToDo): void {
        this.selectedToDo = todo;
        var date = new Date(todo.FixedDate);
        this.day =
            date.getFullYear() +
            '-' +
            ('0' + (date.getMonth() + 1)).slice(-2) +
            '-' +
            ('0' + date.getDate()).slice(-2);
        this.time = date.getHours() + ':' + ('0' + date.getMinutes()).slice(-2);
        this.loginForm.setValue({
            nameControl: todo.name,
            dateControl: this.day,
            timeControl: this.time,
            contentControl: todo.Content,
        });
    }

    hasDate() {
        if (this.minDate > this.loginForm.controls['dateControl'].value) {
            return true;
        }
    }
}

//このバリデータ関数でコンポーネントにあるDateContorolsの情報を取得したいです

function timeCheckValidator(c: AbstractControl) {
    if (this.timeCheckValidatorValueService.time != null) {
        let date = new Date();
        let time = this.timeCheckValidatorValueService.time;
        let now = date.getHours() * 100 + date.getMinutes();
        let split = [];
        split = c.value.split(':');
        let fixedDate = Number(split[0] + split[1]);
        console.log(fixedDate, now, date, time);
        if (time == date && fixedDate <= now) {
            return { timeCheckValidator: true };
        }
    } else {
        return null;
    }
}