The Gregorian calendar.
yes,the us uses the gregorian calendar
Gregorian Calendar is used in all the countries of the world.
a calendar i think that it may also be knowne as a date book
Calendar is popular because of it's use. It makes us informed about the days and future vents.
Calendar is the best timekeeping tool. It helps us to organize our life in a better way. We use calendar to schedule any event.
the Islamic calendar._________________________________Lunar calendar
Spaniards use the Gregorian Calendar just like US Americans and Britons. It starts on January 1st.
the amans use a christian calendar.