[1] [CITE@EN[XPath and XQuery Functions and Operators 3.1]]
([TIME[2014-12-18 06:45:18 +09:00]] 版)
<http://www.w3.org/TR/xpath-functions-3/#rules-for-datetime-formatting>

[2] [CITE@EN[XPath and XQuery Functions and Operators 3.1]]
([TIME[2017-03-21 16:02:06 +09:00]])
<https://www.w3.org/TR/2017/REC-xpath-functions-31-20170321/#syntax-of-picture-string>

[3] [CITE@EN[XPath and XQuery Functions and Operators 3.1]]
([TIME[2017-03-21 16:02:06 +09:00]])
<https://www.w3.org/TR/2017/REC-xpath-functions-31-20170321/#date-picture-string>

[4] [CITE@EN[XSL Transformations (XSLT) Version 3.0]]
([TIME[2017-06-06 21:59:56 +09:00]])
<https://www.w3.org/TR/2017/REC-xslt-30-20170608/#dt-picture-string>