If you mean "Did calendars exist in the Middle Ages?", the answer is yes, but very few people had access to them or could read them. Calendars (kalendae) were part of Church liturgy, to keep track of the dates of Holy Days and the feast days of the Saints.
In the late medieval period some nobles and noblewomen kept "books of hours", which were again religious books that included a calendar of important Church dates. The average working man, even at craftsman or tradesman level would never see such a book - and could not read it if he did.
Calendars were written in Latin, with various numbers alongside the date of each month, representing complex calculations for keeping track of the Church calendar as well as the monthly calendar. They often included an astrological sign for each month and a "labour of the month" - the type of work you might expect to see going on in the fields.
See links below for images:
Yes, the Middle Ages used calendars. Various types of calendars were used during this period, including the Julian calendar, which was widely used in Western Europe until the late Middle Ages, and the liturgical calendar, which was used by the Christian Church to determine religious feasts and observances. Additionally, regional calendars with local variations also existed.
YES
the middle ages
The predominant staircase design in the Middle Ages was the spiral design for stairs. Spiral stairs were used from the medieval ages and are still used in many modern houses.
The hammer and sickle were used in the middle ages for a variety of different tasks. Both items were used to pound things into the ground and to cut grain.
The three main weapons used in middle ages battles in Europe were swords, maces and English longbows
Castles in the Middle Ages were used to keep out enemies.
See the question: What are some weapons used in the middle ages?
In the Middle Ages
people in the middle ages used letters or talking to face to face
because they used wood smoke as a deorderant in the middle ages
knights
YES
to entertain
Yes, polyphony was used during the Middle Ages. We do not have any real idea of when polyphony was introduced, but the earliest texts describing it date to the Early Middle Ages. By the end of the Middle Ages, it was highly developed. There is a link below to an article on polyphony, beginning at the section on its origins.
It was used in the middle ages by monks!
the middle ages
The period of time from 500 AD to 1500 AD is called the Middle Ages.