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Definitions and Terms US & Canadian Holidays
Days Between Dates

Calendar Comparisons

Calendars by Weekdays

Day of the Year

This Day In History

Day of the Year - Leap Year

Table of Seasons

Zodiac Calendar



Time Units

Calendar Comparisons

Julian vs Gregorian

Millenniums & Centuries



1990-1995

1995-2000

2000-2005

2005-2010

2010-2015

2015-2020

Holiday Determination

Holidays Trivia Quiz







Time Measurements


Time is calculated in a variety of ways. For instance, time can be calculated in seconds, minutes, hours, days, weeks, and etc. Below are the different ways time is measured and the definition of each term:

NameDescriptionConversion
Secondsmallest unit of time
Minute60 Seconds
Hour60 Minutes
Daythe 24 hours are normally split into two 12 hour periods
  • AM (from 12:00 midnight to 11:59 AM, one minute before noon)
  • PM (from 12:00 noon till 11:59 PM, one minute before midnight)
24 Hours
Weekthere are 7 days in a Week: Sunday, Monday, Tuesday, Wednesday, Thursday, Friday and Saturday7 Days
Fortnight2 Weeks
Month
2829Days
3031
Quarter3 months
Year
there are 12 months in a year:
JanuaryFebruaryMarchAprilMayJune
JulyAugustSeptemberOctoberNovemberDecember
12 Months
365 or 366 Days
52 Weeks
Leap Yearthe extra day is added in February, day 2912 Months also 366 Days
Olympiad4 Years
Decade10 Years
Century100 Years
Millennium1000 Years
EpochMeasurement of Geologic Time, measured in millions of years
PeriodMeasurement of Geologic Time, composed of a number of epochs
EraMeasurement of Geologic Time, composed of a number of Periods
EonMeasurement of Geologic Time, composed of a number of Eras




19th Century

20th Century

21st Century

Leap Years




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