Reading dates from OpenXml Excel files

Question

I\'m trying to read data from the .xlsx files using SharpZipLib to unpack it (in memory) and reading the inner xml files. Everything is fine but recognizing the dates - they

Answer 1

You should find the numFmts section somewhere near the top of style.xml, as part of the styleSheet element

EDIT

I've been double-checking my xlsx reader code (it's been a long while since I delved into that part of the library); and there are built-in formats. Number format codes (numFmtId) less than 164 are "built-in".

The list that I have is incomplete:

0 = 'General';
1 = '0';
2 = '0.00';
3 = '#,##0';
4 = '#,##0.00';
5 = '$#,##0;\-$#,##0';
6 = '$#,##0;[Red]\-$#,##0';
7 = '$#,##0.00;\-$#,##0.00';
8 = '$#,##0.00;[Red]\-$#,##0.00';
9 = '0%';
10 = '0.00%';
11 = '0.00E+00';
12 = '# ?/?';
13 = '# ??/??';
14 = 'mm-dd-yy';
15 = 'd-mmm-yy';
16 = 'd-mmm';
17 = 'mmm-yy';
18 = 'h:mm AM/PM';
19 = 'h:mm:ss AM/PM';
20 = 'h:mm';
21 = 'h:mm:ss';
22 = 'm/d/yy h:mm';

37 = '#,##0 ;(#,##0)';
38 = '#,##0 ;[Red](#,##0)';
39 = '#,##0.00;(#,##0.00)';
40 = '#,##0.00;[Red](#,##0.00)';

44 = '_("$"* #,##0.00_);_("$"* \(#,##0.00\);_("$"* "-"??_);_(@_)';
45 = 'mm:ss';
46 = '[h]:mm:ss';
47 = 'mmss.0';
48 = '##0.0E+0';
49 = '@';

27 = '[$-404]e/m/d';
30 = 'm/d/yy';
36 = '[$-404]e/m/d';
50 = '[$-404]e/m/d';
57 = '[$-404]e/m/d';

59 = 't0';
60 = 't0.00';
61 = 't#,##0';
62 = 't#,##0.00';
67 = 't0%';
68 = 't0.00%';
69 = 't# ?/?';
70 = 't# ??/??';