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DateFunction

是一个选项，用于指定在诸如 TimeSeries 或 EventSeries 等对象，以及像 DateListPlot 或 DateHistogram 这样的日期可视化函数中应如何解释输入的日期.

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DateFunction

DateFunction

是一个选项，用于指定在诸如 TimeSeries 或 EventSeries 等对象，以及像 DateListPlot 或 DateHistogram 这样的日期可视化函数中应如何解释输入的日期.

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范例

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基本范例  (3)

在 {month,day} 列表生成的日期前加上年份：

Wolfram Language code: data = {{{10, 1}, 8}, {{10, 10}, 10}, {{10, 20}, 12}, {{10, 24}, 14}, {{11, 5}, 15}, {{11, 15}, 20}};
Wolfram Language code: DateListPlot[data, DateFunction :> (Join[{2006}, #]&)]

解释由星期数指明的日期：

Wolfram Language code: data = Table[{i, Sin[i / Pi]}, {i, 50}];
Wolfram Language code: DateListPlot[data, DateFunction :> (DateList[{2006, 1, 1 + # * 7}]&)]

默认情况下，时间序列的日期粒度是根据输入的时间戳推断得出的：

Wolfram Language code: TimeSeries[Range[3], {Today}]
Wolfram Language code: Normal[%]

用 DateFunction 选择不同的粒度：

Wolfram Language code: TimeSeries[Range[3], {Today}, DateFunction -> Function[DateObject[#, "Year"]]]
Wolfram Language code: Normal[%]

范围  (2)

定义一个函数，解释 DateListPlot 的有歧义的日期字符串：

Wolfram Language code: data = {{"06/01/06", 8}, {"07/01/06", 10}, {"08/01/06", 12}, {"09/01/06", 14}, {"10/01/06", 15}, {"11/01/06", 20}};
Wolfram Language code: DateListPlot[data, DateFunction :> (DateList[{#, {"Month", "Day", "YearShort"}}]&)]
Wolfram Language code: DateListPlot[data, DateFunction :> (DateList[{#, {"Day", "Month", "YearShort"}}]&)]
Wolfram Language code: DateListPlot[data, DateFunction :> (DateList[{#, {"YearShort", "Month", "Day"}}]&)]

下面一个日期-数值对列表，其中日期存在歧义：

Wolfram Language code: data = {{"2006 12-1", 8}, {"2006 12-2", 10}, {"2006 12-3", 12}, {"2006 12-4", 14}, {"2006 12-5", 15}, {"2006 12-6", 20}};
Wolfram Language code: DateObject[data[[1, 1]]]

指定解释为“年-月-日”：

Wolfram Language code: EventSeries[data, DateFunction :> (DateObject[{#, {"Year", "Month", "Day"}}, "Day"]&)]
Wolfram Language code: Normal[%]

指定解释为“年-日-月”：

Wolfram Language code: EventSeries[data, DateFunction :> (DateObject[{#, {"Year", "Day", "Month"}}, "Day"]&)]
Wolfram Language code: Normal[%]
Wolfram Research (2007)，DateFunction，Wolfram 语言函数，https://reference.wolfram.com/language/ref/DateFunction.html.

文本

Wolfram Research (2007)，DateFunction，Wolfram 语言函数，https://reference.wolfram.com/language/ref/DateFunction.html.

CMS

Wolfram 语言. 2007. "DateFunction." Wolfram 语言与系统参考资料中心. Wolfram Research. https://reference.wolfram.com/language/ref/DateFunction.html.

APA

Wolfram 语言. (2007). DateFunction. Wolfram 语言与系统参考资料中心. 追溯自 https://reference.wolfram.com/language/ref/DateFunction.html 年

BibTeX

@misc{reference.wolfram_2026_datefunction, author="Wolfram Research", title="{DateFunction}", year="2007", howpublished="\url{https://reference.wolfram.com/language/ref/DateFunction.html}", note=[Accessed: 07-September-2026]}

BibLaTeX

@online{reference.wolfram_2026_datefunction, organization={Wolfram Research}, title={DateFunction}, year={2007}, url={https://reference.wolfram.com/language/ref/DateFunction.html}, note=[Accessed: 07-September-2026]}