Understanding I S O8601dateandtimerepresentationformats培训课件.ppt

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2019-05-25 发布于湖北
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Understanding I S O8601dateandtimerepresentationformats培训课件.ppt

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Dates Calendar dates Ordinal dates Week dates Time of day Local vs. Universal Time Coordinated (UTC) Combined data and time Time-intervals Recurring time-intervals ISO 8601:2000 Overview Representing dates, times, durations and intervals Uses character representation ISO/IEC 646, no spaces Separators (Extended Format) Hyphens, Colons, Solidus, Number sign Truncation Omission of higher order components Reduced Precision Omission of lower order components Expansion- years 0 or years 9999 Fixed length fields using leading zeros Representing dates, times, durations and intervals Designators “P” is time-interval designator “R” is recurring time-interval designator “T” indicates start of Time elements “W” is week designator “Z” is UTC designator Duration designators Y, M, W, D, H, M, S may be used M can be minute, month, or both Calendar Dates Gregorian calendar 1875 is reference point Common (365) and Leap (366) years Leap is every 4th year except centennial years that are not integrally divisible by 400 Gregorian is used even for years 1582 (by mutual agreement). Year 0000 is leap. Calendar week Monday is day 1, Sunday is day 7. Weeks are numbered 1- 52 or 1 - 53. Week 1 includes the first Thursday of year. Alternatively, Week 1 includes Jan 4. Week 1 may include 3 days of last year. Last week may include 3 days of next year. Representing dates Calendar date year, month, day number within month Ordinal date year, day number within year Week date year, week, number within week Representing dates Dates Calendar dates Ordinal dates Week dates Time of day Local vs. Universal Time Coordinated (UTC) Combined data and time Time-intervals Recurring time-intervals ISO 8601:2000 Overview Representing times Hours 00-24 (allowing midnight-midnight) Minutes 00-59 Seconds 00-60 (allowing leap seconds) Decimal fractions of hour, minute, second Local and Universal (UTC) time Representing times Combined date and time “T” indicates start of time Mix and match as needed: Calendar date