Ключевые слова: 21, 2017, 21st, appointment, background, birthday, business, calendar, coffee, concept, conceptual, corporate, course, daily, date, day, deadline, diary, elearning, empty space, event, first, freelance, glasses, idea, important, january, media, message, month, monthly, morning, note, notice, number, office, organize, organizer, outsource, planner, remember, remind, reminder, selfeducation, sign, time, tomorrow, twenty, winter, workplace,