Questions and Answers
What is the primary purpose of ISO 8601?
What is Unix Time used for?
What is the definition of a leap year?
What is the primary purpose of Date Arithmetic?
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What is the main purpose of Daylight Saving Time (DST)?
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Study Notes
Date in Computing
Definition
A date is a representation of a specific point in time, usually consisting of a combination of year, month, and day.
Components
- Year: A four-digit number representing the year (e.g., 2023)
- Month: A one- or two-digit number representing the month (e.g., 1-12)
- Day: A one- or two-digit number representing the day of the month (e.g., 1-31)
Date Formats
-
ISO 8601: An international standard for representing dates and times, in the format
YYYY-MM-DDTHH:MM:SSZ
(e.g., 2023-03-15T14:30:00Z) - Unix Time: A system for representing dates as the number of seconds since January 1, 1970, 00:00:00 UTC (e.g., 1678903400)
Operations
- Date Arithmetic: Performing calculations on dates, such as adding or subtracting a specified interval (e.g., adding 3 days to a date)
- Date Comparison: Comparing two or more dates to determine which is earlier, later, or equal
Date-related Concepts
- Leap Year: A year that is exactly divisible by 4, except for years that are exactly divisible by 100, but not by 400
- Time Zone: A region on Earth that follows a uniform standard time, usually based on the mean solar time at a specific meridian
- Daylight Saving Time (DST): The practice of temporarily advancing clocks during the summer months to make better use of daylight
Date in Computing
Components of a Date
- A date consists of three components: year, month, and day
- Year: A four-digit number (e.g., 2023)
- Month: A one- or two-digit number (e.g., 1-12)
- Day: A one- or two-digit number (e.g., 1-31)
Date Formats
-
ISO 8601: International standard format for dates and times:
YYYY-MM-DDTHH:MM:SSZ
(e.g., 2023-03-15T14:30:00Z) - Unix Time: Representing dates as the number of seconds since January 1, 1970, 00:00:00 UTC (e.g., 1678903400)
Date Operations
- Date Arithmetic: Performing calculations on dates, such as adding or subtracting a specified interval
- Date Comparison: Comparing two or more dates to determine which is earlier, later, or equal
Date-related Concepts
Leap Year
- A year that is exactly divisible by 4, except for years that are exactly divisible by 100, but not by 400
Time Zone
- A region on Earth that follows a uniform standard time, usually based on the mean solar time at a specific meridian
Daylight Saving Time (DST)
- The practice of temporarily advancing clocks during the summer months to make better use of daylight
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Description
Learn about dates in computing, including components and formats such as ISO 8601. Understand how to represent specific points in time.