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<chapter id="functions">

<title>Functions and Operators</title>

<listitem>

<para>

<function>to_char(..., 'ID')</function>'s day of the week numbering

matches the <function>extract('isodow', ...)</function> function.

matches the <function>extract('isodow', ...)</function> function, but

<function>to_char(..., 'D')</function>'s does not match

<function>extract('dow', ...)</function>'s day numbering.

</para>