export interface IUtils<TDate> {
  locale?: any;
  moment?: any;
  dayjs?: any;

  yearFormat: string;
  yearMonthFormat: string;

  dateTime12hFormat: string;
  dateTime24hFormat: string;

  time12hFormat: string;
  time24hFormat: string;

  dateFormat: string;
  // constructor (options?: { locale?: any, moment?: any });

  date(value?: any): TDate | null;
  parse(value: string, format: string): TDate | null;

  isNull(value: TDate | null): boolean;
  isValid(value: any): boolean;
  getDiff(value: TDate, comparing: TDate | string): number;
  isEqual(value: any, comparing: any): boolean;

  isSameDay(value: TDate, comparing: TDate): boolean;
  isSameMonth(value: TDate, comparing: TDate): boolean;
  isSameYear(value: TDate, comparing: TDate): boolean;
  isSameHour(value: TDate, comparing: TDate): boolean;

  isAfter(value: TDate, comparing: TDate): boolean;
  isAfterDay(value: TDate, comparing: TDate): boolean;
  isAfterYear(value: TDate, comparing: TDate): boolean;

  isBeforeDay(value: TDate, comparing: TDate): boolean;
  isBeforeYear(value: TDate, comparing: TDate): boolean;
  isBefore(value: TDate, comparing: TDate): boolean;

  startOfMonth(value: TDate): TDate;
  endOfMonth(value: TDate): TDate;

  addDays(value: TDate, count: number): TDate;

  startOfDay(value: TDate): TDate;
  endOfDay(value: TDate): TDate;

  format(value: TDate, formatString: string): string;
  formatNumber(numberToFormat: string): string;

  getHours(value: TDate): number;
  setHours(value: TDate, count: number): TDate;

  getMinutes(value: TDate): number;
  setMinutes(value: TDate, count: number): TDate;

  getSeconds(value: TDate): number;
  setSeconds(value: TDate, count: number): TDate;

  getMonth(value: TDate): number;
  setMonth(value: TDate, count: number): TDate;
  getNextMonth(value: TDate): TDate;
  getPreviousMonth(value: TDate): TDate;

  getMonthArray(value: TDate): TDate[];

  getYear(value: TDate): number;
  setYear(value: TDate, count: number): TDate;

  mergeDateAndTime(date: TDate, time: TDate): TDate;

  getWeekdays(): string[];
  getWeekArray(date: TDate): TDate[][];
  getYearRange(start: TDate, end: TDate): TDate[];

  // displaying methods
  getMeridiemText(ampm: "am" | "pm"): string;
  getCalendarHeaderText(date: TDate): string;
  getDatePickerHeaderText(date: TDate): string;
  getDateTimePickerHeaderText(date: TDate): string;
  getMonthText(date: TDate): string;
  getDayText(date: TDate): string;
  getHourText(date: TDate, ampm: boolean): string;
  getMinuteText(date: TDate): string;
  getSecondText(date: TDate): string;
  getYearText(date: TDate): string;
}