56 lines
2.0 KiB
Markdown
56 lines
2.0 KiB
Markdown
[time.clock.file.nonmembers]
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# 30 Time library [[time]](./#time)
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## 30.7 Clocks [[time.clock]](time.clock#file.nonmembers)
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### 30.7.6 Type file_clock [[time.clock.file]](time.clock.file#nonmembers)
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#### 30.7.6.3 Non-member functions [time.clock.file.nonmembers]
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[ð](#lib:operator%3c%3c,file_time)
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`template<class charT, class traits, class Duration>
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basic_ostream<charT, traits>&
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operator<<(basic_ostream<charT, traits>& os, const file_time<Duration>& t);
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`
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[1](#1)
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[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/time.tex#L3423)
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*Effects*: Equivalent to:return os << format(os.getloc(), *STATICALLY-WIDEN*<charT>("{:L%F %T}"), t);
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[ð](#lib:from_stream,file_time)
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`template<class charT, class traits, class Duration, class Alloc = allocator<charT>>
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basic_istream<charT, traits>&
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from_stream(basic_istream<charT, traits>& is, const charT* fmt,
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file_time<Duration>& tp, basic_string<charT, traits, Alloc>* abbrev = nullptr,
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minutes* offset = nullptr);
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`
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[2](#2)
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[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/time.tex#L3441)
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*Effects*: Attempts to parse the input stream is into the file_time tp using
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the format flags given in the NTCTS fmt as specified in [[time.parse]](time.parse "30.13 Parsing")[.](#2.sentence-1)
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If the parse fails to decode a valid date,is.setstate(ios_base::failbit) is called andtp is not modified[.](#2.sentence-2)
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If %Z is used and successfully parsed,
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that value will be assigned to *abbrev if abbrev is non-null[.](#2.sentence-3)
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If %z (or a modified variant) is used and successfully parsed,
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that value will be assigned to *offset if offset is non-null[.](#2.sentence-4)
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Additionally, the parsed offset will be subtracted from
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the successfully parsed timestamp prior to assigning that difference to tp[.](#2.sentence-5)
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[3](#3)
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[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/time.tex#L3457)
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*Returns*: is[.](#3.sentence-1)
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