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Section: 29.7.2 [time.clock.system] Status: C++11 Submitter: Pete Becker Opened: 2009-01-07 Last modified: 2016-01-28
Priority: Not Prioritized
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29.7.2 [time.clock.system]: to_time_t is overspecified. It requires truncation, but should allow rounding. For example, suppose a system has a clock that gives times in milliseconds, but time() rounds those times to the nearest second. Then system_clock can't use any resolution finer than one second, because if it did, truncating times between half a second and a full second would produce the wrong time_t value.
[ Post Summit Anthony Williams provided proposed wording. ]
[ Batavia (2009-05): ]
Move to Review pending input from Howard. and other stakeholders.
[ 2009-05-23 Howard adds: ]
I am in favor of the wording provided by Anthony.
[ 2009-10 Santa Cruz: ]
Move to Ready.
In 29.7.2 [time.clock.system] replace paragraphs 3 and 4 with:
time_t to_time_t(const time_point& t);
-3- Returns: A time_t object that represents the same point in time as t when both values are
truncatedto the coarser of the precisions of time_t and time_point.time_point from_time_t(time_t t);
-4- Returns: A time_point object that represents the same point in time as t when both values are
truncatedto the coarser of the precisions of time_t and time_point.