Mailspring/app/internal_packages/contacts/lib/YYMMDDInput.tsx

import React from 'react';

interface YYMMDD {
  year: number;
  month: number;
  day: number;
}
interface YYMMDDInputProps {
  value: YYMMDD;
  onChange: (date: YYMMDD) => void;
}

export class YYMMDDInput extends React.Component<YYMMDDInputProps> {
  _year = React.createRef<HTMLInputElement>();
  _month = React.createRef<HTMLInputElement>();
  _day = React.createRef<HTMLInputElement>();

  _onBlur = () => {
    const year = Number(this._year.current.value);
    const month = Number(this._month.current.value);
    const day = Number(this._day.current.value);
    this.props.onChange({ year, month, day });
  };

  render() {
    const { year, month, day } = this.props.value;

    return (
      <div>
        <label>Birthday</label>
        <div style={{ display: 'flex' }}>
          <div className="contact-edit-field">
            <input
              ref={this._year}
              type="number"
              defaultValue={`${year}`}
              style={{ width: 60, marginRight: 5 }}
              placeholder="YYYY"
              onBlur={this._onBlur}
            />
          </div>
          <div className="contact-edit-field">
            <input
              max={12}
              min={1}
              ref={this._month}
              style={{ width: 50, marginRight: 5 }}
              placeholder="MM"
              type="number"
              defaultValue={`${month}`}
              onBlur={this._onBlur}
            />
          </div>
          <div className="contact-edit-field">
            <input
              max={31}
              min={1}
              ref={this._day}
              placeholder="DD"
              type="number"
              style={{ width: 46 }}
              defaultValue={`${day}`}
              onBlur={this._onBlur}
            />
          </div>
          <div style={{ flex: 1 }} />
        </div>
      </div>
    );
  }
}