Created a period table for date ranges and made the recipes dependent on it instead of having arbitrary date ranges. This will enable easy copying into new months.

overlord/src/app/period/period-detail/period-detail.component.html

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+<mat-card>
+  <mat-card-title-group>
+    <mat-card-title>Period</mat-card-title>
+  </mat-card-title-group>
+  <mat-card-content>
+    <form [formGroup]="form" fxLayout="column">
+      <div fxLayout="row">
+        <mat-form-field fxFlex>
+          <input
+            matInput
+            [matDatepicker]="validFrom"
+            placeholder="Valid From"
+            formControlName="validFrom"
+            autocomplete="off"
+          />
+          <mat-datepicker-toggle matSuffix [for]="validFrom"></mat-datepicker-toggle>
+          <mat-datepicker #validFrom></mat-datepicker>
+        </mat-form-field>
+      </div>
+      <div fxLayout="row">
+        <mat-form-field fxFlex>
+          <input
+            matInput
+            [matDatepicker]="validTill"
+            placeholder="Valid Till"
+            formControlName="validTill"
+            autocomplete="off"
+          />
+          <mat-datepicker-toggle matSuffix [for]="validTill"></mat-datepicker-toggle>
+          <mat-datepicker #validTill></mat-datepicker>
+        </mat-form-field>
+      </div>
+    </form>
+  </mat-card-content>
+  <mat-card-actions>
+    <button mat-raised-button color="primary" (click)="save()">Save</button>
+    <button mat-raised-button color="warn" (click)="confirmDelete()" *ngIf="!!item.id">
+      Delete
+    </button>
+  </mat-card-actions>
+</mat-card>

overlord/src/app/period/period-detail/period-detail.component.spec.ts

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+import { ComponentFixture, TestBed, waitForAsync } from '@angular/core/testing';
+import { ReactiveFormsModule } from '@angular/forms';
+import { MatDialogModule } from '@angular/material/dialog';
+import { RouterTestingModule } from '@angular/router/testing';
+
+import { PeriodDetailComponent } from './period-detail.component';
+
+describe('PeriodDetailComponent', () => {
+  let component: PeriodDetailComponent;
+  let fixture: ComponentFixture<PeriodDetailComponent>;
+
+  beforeEach(waitForAsync(() => {
+    TestBed.configureTestingModule({
+      imports: [MatDialogModule, ReactiveFormsModule, RouterTestingModule],
+      declarations: [PeriodDetailComponent],
+    }).compileComponents();
+  }));
+
+  beforeEach(() => {
+    fixture = TestBed.createComponent(PeriodDetailComponent);
+    component = fixture.componentInstance;
+    fixture.detectChanges();
+  });
+
+  it('should create', () => {
+    expect(component).toBeTruthy();
+  });
+});

overlord/src/app/period/period-detail/period-detail.component.ts

@@ -0,0 +1,97 @@
+import { Component, OnInit } from '@angular/core';
+import { FormControl, FormGroup } from '@angular/forms';
+import { MatDialog } from '@angular/material/dialog';
+import { ActivatedRoute, Router } from '@angular/router';
+import * as moment from 'moment';
+
+import { ToasterService } from '../../core/toaster.service';
+import { ConfirmDialogComponent } from '../../shared/confirm-dialog/confirm-dialog.component';
+import { Period } from '../period';
+import { PeriodService } from '../period.service';
+
+@Component({
+  selector: 'app-period-detail',
+  templateUrl: './period-detail.component.html',
+  styleUrls: ['./period-detail.component.css'],
+})
+export class PeriodDetailComponent implements OnInit {
+  form: FormGroup<{
+    validFrom: FormControl<Date>;
+    validTill: FormControl<Date>;
+  }>;
+
+  item: Period = new Period();
+
+  constructor(
+    private route: ActivatedRoute,
+    private router: Router,
+    private dialog: MatDialog,
+    private toaster: ToasterService,
+    private ser: PeriodService,
+  ) {
+    this.form = new FormGroup({
+      validFrom: new FormControl(new Date(), { nonNullable: true }),
+      validTill: new FormControl(new Date(), { nonNullable: true }),
+    });
+  }
+
+  ngOnInit() {
+    this.route.data.subscribe((value) => {
+      const data = value as { item: Period };
+
+      this.showItem(data.item);
+    });
+  }
+
+  showItem(item: Period) {
+    this.item = item;
+    this.form.setValue({
+      validFrom: moment(this.item.validFrom, 'DD-MMM-YYYY').toDate(),
+      validTill: moment(this.item.validTill, 'DD-MMM-YYYY').toDate(),
+    });
+  }
+
+  save() {
+    this.ser.saveOrUpdate(this.getItem()).subscribe(
+      () => {
+        this.toaster.show('Success', '');
+        this.router.navigateByUrl('/periods');
+      },
+      (error) => {
+        this.toaster.show('Danger', error);
+      },
+    );
+  }
+
+  delete() {
+    this.ser.delete(this.item.id as string).subscribe(
+      () => {
+        this.toaster.show('Success', '');
+        this.router.navigateByUrl('/periods');
+      },
+      (error) => {
+        this.toaster.show('Danger', error);
+      },
+    );
+  }
+
+  confirmDelete(): void {
+    const dialogRef = this.dialog.open(ConfirmDialogComponent, {
+      width: '250px',
+      data: { title: 'Delete Period?', content: 'Are you sure? This cannot be undone.' },
+    });
+
+    dialogRef.afterClosed().subscribe((result: boolean) => {
+      if (result) {
+        this.delete();
+      }
+    });
+  }
+
+  getItem(): Period {
+    const formValue = this.form.value;
+    this.item.validFrom = moment(formValue.validFrom).format('DD-MMM-YYYY');
+    this.item.validTill = moment(formValue.validTill).format('DD-MMM-YYYY');
+    return this.item;
+  }
+}