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[SPARK-31030][DOCS][FOLLOWUP] Replace HTML Table by Markdown Table
### What changes were proposed in this pull request? This PR is to clean up the markdown file in datetime-pattern page. - Replace HTML table by MD table ### Why are the changes needed? Make the doc cleaner and easily editable by MD editors. ### Does this PR introduce _any_ user-facing change? NO ### How was this patch tested? **Before** ![Screen Shot 2020-04-29 at 7 59 10 PM](https://user-images.githubusercontent.com/11567269/80668093-c9294600-8a55-11ea-9dca-d558203298f8.png) **After** ![Screen Shot 2020-04-29 at 8 13 38 PM](https://user-images.githubusercontent.com/11567269/80668146-f1b14000-8a55-11ea-8d47-8dc8a0378271.png) Closes #28415 from gatorsmile/cleanupUDFPage. Authored-by: gatorsmile <[email protected]> Signed-off-by: Wenchen Fan <[email protected]>
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‎docs/sql-ref-datetime-pattern.md‎

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@@ -28,194 +28,38 @@ There are several common scenarios for datetime usage in Spark:
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Spark uses pattern letters in the following table for date and timestamp parsing and formatting:
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<table class="table">
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<tr>
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<th> <b>Symbol</b> </th>
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<th> <b>Meaning</b> </th>
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<th> <b>Presentation</b> </th>
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<th> <b>Examples</b> </th>
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</tr>
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<tr>
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<td> <b>G</b> </td>
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<td> era </td>
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<td> text </td>
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<td> AD; Anno Domini; A </td>
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</tr>
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<tr>
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<td> <b>y</b> </td>
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<td> year </td>
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<td> year </td>
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<td> 2020; 20 </td>
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</tr>
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<tr>
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<td> <b>D</b> </td>
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<td> day-of-year </td>
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<td> number </td>
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<td> 189 </td>
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</tr>
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<tr>
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<td> <b>M/L</b> </td>
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<td> month-of-year </td>
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<td> number/text </td>
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<td> 7; 07; Jul; July; J </td>
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</tr>
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<tr>
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<td> <b>d</b> </td>
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<td> day-of-month </td>
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<td> number </td>
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<td> 28 </td>
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</tr>
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<tr>
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<td> <b>Q/q</b> </td>
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<td> quarter-of-year </td>
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<td> number/text </td>
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<td> 3; 03; Q3; 3rd quarter </td>
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</tr>
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<tr>
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<td> <b>Y</b> </td>
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<td> week-based-year </td>
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<td> year </td>
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<td> 1996; 96 </td>
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</tr>
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<tr>
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<td> <b>w</b> </td>
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<td> week-of-week-based-year </td>
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<td> number </td>
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<td> 27 </td>
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</tr>
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<tr>
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<td> <b>W</b> </td>
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<td> week-of-month </td>
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<td> number </td>
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<td> 4 </td>
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</tr>
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<tr>
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<td> <b>E</b> </td>
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<td> day-of-week </td>
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<td> text </td>
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<td> Tue; Tuesday; T </td>
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</tr>
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<tr>
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<td> <b>u</b> </td>
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<td> localized day-of-week </td>
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<td> number/text </td>
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<td> 2; 02; Tue; Tuesday; T </td>
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</tr>
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<tr>
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<td> <b>F</b> </td>
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<td> week-of-month </td>
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<td> number </td>
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<td> 3 </td>
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</tr>
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<tr>
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<td> <b>a</b> </td>
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<td> am-pm-of-day </td>
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<td> text </td>
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<td> PM </td>
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</tr>
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<tr>
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<td> <b>h</b> </td>
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<td> clock-hour-of-am-pm (1-12) </td>
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<td> number </td>
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<td> 12 </td>
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</tr>
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<tr>
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<td> <b>K</b> </td>
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<td> hour-of-am-pm (0-11) </td>
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<td> number </td>
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<td> 0 </td>
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</tr>
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<tr>
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<td> <b>k</b> </td>
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<td> clock-hour-of-day (1-24) </td>
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<td> number </td>
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<td> 0 </td>
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</tr>
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<tr>
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<td> <b>H</b> </td>
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<td> hour-of-day (0-23) </td>
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<td> number </td>
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<td> 0 </td>
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</tr>
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<tr>
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<td> <b>m</b> </td>
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<td> minute-of-hour </td>
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<td> number </td>
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<td> 30 </td>
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</tr>
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<tr>
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<td> <b>s</b> </td>
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<td> second-of-minute </td>
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<td> number </td>
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<td> 55 </td>
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</tr>
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<tr>
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<td> <b>S</b> </td>
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<td> fraction-of-second </td>
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<td> fraction </td>
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<td> 978 </td>
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</tr>
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<tr>
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<td> <b>V</b> </td>
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<td> time-zone ID </td>
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<td> zone-id </td>
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<td> America/Los_Angeles; Z; -08:30 </td>
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</tr>
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<tr>
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<td> <b>z</b> </td>
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<td> time-zone name </td>
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<td> zone-name </td>
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<td> Pacific Standard Time; PST </td>
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</tr>
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<tr>
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<td> <b>O</b> </td>
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<td> localized zone-offset </td>
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<td> offset-O </td>
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<td> GMT+8; GMT+08:00; UTC-08:00; </td>
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</tr>
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<tr>
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<td> <b>X</b> </td>
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<td> zone-offset 'Z' for zero </td>
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<td> offset-X </td>
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<td> Z; -08; -0830; -08:30; -083015; -08:30:15; </td>
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</tr>
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<tr>
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<td> <b>x</b> </td>
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<td> zone-offset </td>
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<td> offset-x </td>
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<td> +0000; -08; -0830; -08:30; -083015; -08:30:15; </td>
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</tr>
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<tr>
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<td> <b>Z</b> </td>
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<td> zone-offset </td>
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<td> offset-Z </td>
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<td> +0000; -0800; -08:00; </td>
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</tr>
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<tr>
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<td> <b>'</b> </td>
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<td> escape for text </td>
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<td> delimiter </td>
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<td></td>
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</tr>
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<tr>
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<td> <b>''</b> </td>
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<td> single quote </td>
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<td> literal </td>
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<td> ' </td>
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</tr>
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<tr>
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<td> <b>[</b> </td>
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<td> optional section start </td>
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<td> </td>
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<td> </td>
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</tr>
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<tr>
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<td> <b>]</b> </td>
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<td> optional section end </td>
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<td> </td>
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<td> </td>
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</tr>
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</table>
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|Symbol|Meaning|Presentation|Examples|
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|--- |--- |--- |--- |
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|**G**|era|text|AD; Anno Domini; A|
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|**y**|year|year|2020; 20|
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|**D**|day-of-year|number|189|
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|**M/L**|month-of-year|number/text|7; 07; Jul; July; J|
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|**d**|day-of-month|number|28|
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|**Q/q**|quarter-of-year|number/text|3; 03; Q3; 3rd quarter|
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|**Y**|week-based-year|year|1996; 96|
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|**w**|week-of-week-based-year|number|27|
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|**W**|week-of-month|number|4|
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|**E**|day-of-week|text|Tue; Tuesday; T|
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|**u**|localized day-of-week|number/text|2; 02; Tue; Tuesday; T|
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|**F**|week-of-month|number|3|
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|**a**|am-pm-of-day|text|PM|
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|**h**|clock-hour-of-am-pm (1-12)|number|12|
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|**K**|hour-of-am-pm (0-11)|number|0|
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|**k**|clock-hour-of-day (1-24)|number|0|
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|**H**|hour-of-day (0-23)|number|0|
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|**m**|minute-of-hour|number|30|
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|**s**|second-of-minute|number|55|
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|**S**|fraction-of-second|fraction|978|
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|**V**|time-zone ID|zone-id|America/Los_Angeles; Z; -08:30|
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|**z**|time-zone name|zone-name|Pacific Standard Time; PST|
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|**O**|localized zone-offset|offset-O|GMT+8; GMT+08:00; UTC-08:00;|
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|**X**|zone-offset 'Z' for zero|offset-X|Z; -08; -0830; -08:30; -083015; -08:30:15;|
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|**x**|zone-offset|offset-x|+0000; -08; -0830; -08:30; -083015; -08:30:15;|
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|**Z**|zone-offset|offset-Z|+0000; -0800; -08:00;|
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|**'**|escape for text|delimiter||
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|**''**|single quote|literal|'|
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|**[**|optional section start|||
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|**]**|optional section end|||
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The count of pattern letters determines the format.
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