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DatePattern
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DatePattern

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DatePattern[{"e1","e2",…}]

represents the characters of a date with elements of type "ei" in StringExpression.

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DatePattern[{"e1","e2",…},sep]

allows separators that match the string expression sep.

Details

  • Possible element types "ei" are: "Year", "Quarter", "Month", "MonthName", "Day", "DayName", "Hour", "AMPM", "Minute", "Second".
  • If no explicit separator is specified, the "ei" must be separated by /, -, :, or . characters.

Examples

open allclose all

Basic Examples  (3)Summary of the most common use cases

Compare a string to a list of date elements:

In[1]:=1
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https://wolfram.com/xid/0i1o1d11e-jfu30b
Out[1]=1

Compare to a list of time elements:

In[1]:=1
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https://wolfram.com/xid/0i1o1d11e-ns7zks
Out[1]=1

Compare to a pattern with all separators explicitly given:

In[1]:=1
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https://wolfram.com/xid/0i1o1d11e-ex6nyd
Out[1]=1

Scope  (2)Survey of the scope of standard use cases

Date elements do not match out-of-range values:

In[1]:=1
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https://wolfram.com/xid/0i1o1d11e-oasitt
Out[1]=1

Test a string allowing only "/" characters as separators:

In[1]:=1
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https://wolfram.com/xid/0i1o1d11e-hzt0dd
Out[1]=1

Test the same string allowing only colon separators:

In[2]:=2
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https://wolfram.com/xid/0i1o1d11e-m3z0cq
Out[2]=2

Applications  (1)Sample problems that can be solved with this function

Define a function only for month, year strings:

In[1]:=1
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https://wolfram.com/xid/0i1o1d11e-cq6qo
In[2]:=2
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https://wolfram.com/xid/0i1o1d11e-ekb4sv
Out[2]=2

The function returns unevaluated for other input patterns:

In[3]:=3
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https://wolfram.com/xid/0i1o1d11e-dtezxu
Out[3]=3

Properties & Relations  (1)Properties of the function, and connections to other functions

DateString gives results that match a date pattern:

In[1]:=1
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https://wolfram.com/xid/0i1o1d11e-hmtb46
Out[1]=1
In[2]:=2
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https://wolfram.com/xid/0i1o1d11e-mepep9
Out[2]=2
Wolfram Research (2007), DatePattern, Wolfram Language function, https://reference.wolfram.com/language/ref/DatePattern.html.
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Wolfram Research (2007), DatePattern, Wolfram Language function, https://reference.wolfram.com/language/ref/DatePattern.html.

Text

Wolfram Research (2007), DatePattern, Wolfram Language function, https://reference.wolfram.com/language/ref/DatePattern.html.

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Wolfram Research (2007), DatePattern, Wolfram Language function, https://reference.wolfram.com/language/ref/DatePattern.html.

CMS

Wolfram Language. 2007. "DatePattern." Wolfram Language & System Documentation Center. Wolfram Research. https://reference.wolfram.com/language/ref/DatePattern.html.

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Wolfram Language. 2007. "DatePattern." Wolfram Language & System Documentation Center. Wolfram Research. https://reference.wolfram.com/language/ref/DatePattern.html.

APA

Wolfram Language. (2007). DatePattern. Wolfram Language & System Documentation Center. Retrieved from https://reference.wolfram.com/language/ref/DatePattern.html

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Wolfram Language. (2007). DatePattern. Wolfram Language & System Documentation Center. Retrieved from https://reference.wolfram.com/language/ref/DatePattern.html

BibTeX

@misc{reference.wolfram_2025_datepattern, author="Wolfram Research", title="{DatePattern}", year="2007", howpublished="\url{https://reference.wolfram.com/language/ref/DatePattern.html}", note=[Accessed: 25-May-2025 ]}

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@misc{reference.wolfram_2025_datepattern, author="Wolfram Research", title="{DatePattern}", year="2007", howpublished="\url{https://reference.wolfram.com/language/ref/DatePattern.html}", note=[Accessed: 25-May-2025 ]}

BibLaTeX

@online{reference.wolfram_2025_datepattern, organization={Wolfram Research}, title={DatePattern}, year={2007}, url={https://reference.wolfram.com/language/ref/DatePattern.html}, note=[Accessed: 25-May-2025 ]}

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@online{reference.wolfram_2025_datepattern, organization={Wolfram Research}, title={DatePattern}, year={2007}, url={https://reference.wolfram.com/language/ref/DatePattern.html}, note=[Accessed: 25-May-2025 ]}