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Nautical time zone letters are not used with the exception of Z
To calculate UTC time one has to subtract the offset from the local time, e.g
for "15:00-03:30" do 15:00 − (−03:30) to get 18:30 UTC.
The offset can also be used in the case where the UTC time is known, but the local offset is not
In this case the offset is "-00:00", which is semantically different from "Z" or "+00:00", as these imply that UTC is the preferred reference point for those times.
Combining date and time representations to represent a single point in time (time point) is quite simple
It is in the format of T where the time designator is used to show the start of the time component of the representation
Both the date and time components of the time point are any proper representations of date and time specified by the standard
For example, "2007-04-05T14:30" uses the extended formats for date and time Z.
A combined date and time representation, often called (and so named in many DBMS type ontologies) a timestamp, can be used to mark any type of event time such as an e-mail delivery, a financial transaction, the start of a medical treatment, or even a natural occurrence (like the June solstice of 2009 shown above)
Combined date and time representations are also used in conjunction with time intervals as discussed later in this article.
The date and time representations may appear in proximity to each other, often separated by a space or sometimes by other characters
In these cases they occupy two separate fields in a data system, rather than a single combined representation
This is usually done for human readability
Unlike the previous examples, "2007-04-05 14:30" is considered two separate, but acceptable, representations—one for date and the other for time
It is then left to the reader to interpret the two separate representations as meaning a single time point based on the context.
Durations are a component of time intervals and define the amount of intervening time in a time interval
They should only be used as part of a time interval as prescribed by the standard
Time intervals are discussed in the next section.
Durations are represented by the format PW as shown to the right