Date: ISO/WD ISO/TC /WG 5. Secretariat: SAC. Data elements and interchange formats — Information interchange -. WG5_N_ISO_WD__docx STD Version f. ISO/TC N Date: ISO/WD ISO/TC /WG 5. Secretariat: SAC. ISO Pages: Download a Copy of the ISO Standard. wfhm.info ch/markete/pdf · wfhm.info
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ISO (the International Organization for Standardization) is a worldwide International Standard ISO was prepared by Technical. This document specifies representations of dates of the Gregorian calendar and times based on the hour clock, as well as composite. amendment of the recurring time interval () to provide a link to ISO which contains in Clause 5 the “repeat rules for recurring time intervals”.
Writing a four-digit year will at least tell you which one is the year.
But were still left the other problem, which is more important globally: What to do? In the financial world, for instance, an ambiguous date on a transaction could mean a difference of a significant amount of money, if interest calculations are involved.
For this reason, the only acceptable date formats should be either the full literate forms, with a four-digit year of course, such as the American English "June 23, " or the British English "23 June ", or the ISO form, "". After you read the links below, you will understand why there can be no other date formats tolerated in this day of global communication.
And, for other than literary purposes, such as for finance or data processing, the all-numeric ISO form should be the only form used. You might want to let them know. Academic Computing and Communications Center. ISO Dates: In Programs.
In Output. On Personal Computers. Important Dates. Systems that are configured with a local time, are unaware of the corresponding UTC offset, and depend on time synchronization with other Internet systems, MUST use a mechanism that ensures correct synchronization with UTC. This host MUST correct unqualified local times that are transmitted to other hosts.
Date and Time format This section discusses desirable qualities of date and time formats and defines a profile of ISO for use in Internet protocols. Ordering If date and time components are ordered from least precise to most precise, then a useful property is achieved. Assuming that the time zones of the dates and times are the same e. The presence of optional punctuation would violate this characteristic.
Human Readability Human readability has proved to be a valuable feature of Internet protocols. Human readable protocols greatly reduce the costs of debugging since telnet often suffices as a test client and network analyzers need not be modified with knowledge of the protocol.
On the other hand, human readability sometimes results in interoperability problems. In addition, the date format in [ IMAIL ] has resulted in interoperability problems when people assumed any text string was permitted and translated the three letter abbreviations to other languages or substituted date formats which were easier to generate e.
For this reason, a balance must be struck between human readability and interoperability. Because no date and time format is readable according to the conventions of all countries, Internet clients SHOULD be prepared to transform dates into a display format suitable for the locality. This may include translating UTC to local time. Rarely Used Options A format which includes rarely used options is likely to cause interoperability problems. This is because rarely used options are less likely to be used in alpha or beta testing, so bugs in parsing are less likely to be discovered.
Rarely used options should be made mandatory or omitted for the sake of interoperability whenever possible. The format defined below includes only one rarely used option: fractions of a second.
Simplicity The complete set of date and time formats specified in ISO [ ISO ] is quite complex in an attempt to provide multiple representations and partial representations. Internet protocols have somewhat different requirements and simplicity has proved to be an important characteristic. In addition, Internet protocols usually need complete specification of data in order to achieve true interoperability.
Therefore, the complete grammar for ISO is deemed too complex for most Internet protocols.
The following section defines a profile of ISO for use on the Internet. It is a conformant subset of the ISO extended format.
Simplicity is achieved by making most fields and punctuation mandatory. This is specified using the syntax description notation defined in [ ABNF ]. Applications using this syntax may choose, for the sake of readability, to specify a full-date and full-time separated by say a space character.
Restrictions The grammar element date-mday represents the day number within the current month. It is also possible for a leap second to be subtracted, at which times the maximum value of time-second is "58".
ISO date format
At all other times the maximum value of time-second is "59". Further, in time zones other than "Z", the leap second point is shifted by the zone offset so it happens at the same instant around the globe.
Leap seconds cannot be predicted far into the future. Applications should not generate timestamps involving inserted leap seconds until after the leap seconds are announced.
Although ISO permits the hour to be "24", this profile of ISO only allows values between "00" and "23" for the hour in order to reduce confusion. Standard time in the Netherlands was exactly 19 minutes and Security Considerations Since the local time zone of a site may be useful for determining a time when systems are less likely to be monitored and might be more susceptible to a security probe, some sites may wish to emit times in UTC only.
Others might consider this to be loss of useful functionality at the hands of paranoia.
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There may be some changes in the revision. ISO does not specify a formal grammar for the date and time formats it defines. Specifically, I can imagine a person who under ideal conditions would spend some necessary days to learn all the details of that formats and date use cases and what not to have some other circumstances in which it has to produce some result fast or while distracted, and that other persons who are in charge to confirm what that person produced also fail to recognize the error, to the point that the subtly wrong implementation is eventually not properly tested.
Which is what provably also happens in practice. And I also really saw the persons capable of learning and remembering a huge amount of all unnecessary for me switches for commands x, y, z, x1, y1, z1 etc, in some other, still not too stressful situation unable to eventually manage to install the mentioned printer on the same OS. In the same sense, the writer of manual who spends days learning about all the features that he documents should not assume that his readers will spend the same amount of time or will have necessary conditions to figure out all nuances that were "obvious" to the writer at that specific moment.
In fact the similar forces that produce buggy code are the ones that produce poor documentation. So we should not try to excuse both bad code and bad documentation, but instead support the "empathy" for the possible less-than-ideal conditions of our users.
And I claim that the documentation obviously produced without understanding what most of the users need to be able to easily read from it is bad, and that it should be recognized as such.
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Reacting to that with "Hell yeah! Of course, speople e.This convention regarding "" is derived from earlier RFCs, such as RFC which uses it for timestamps in email headers.
The smallest value used may also have a decimal fraction, as in "P0. Now, this was not where I wanted to leave this Check out our FAQs.
Applications using this syntax may choose, for the sake of readability, to specify a full-date and full-time separated by say a space character.
If greater precision is desirable to represent the time interval, then more time elements can be added to the representation. Full report circulated: Section 4.
However, many historical time zones differ from UTC by a non- integral number of minutes. The right format for dates in data -- and in the real world -- is one that is totally unambiguous.
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