Date format 14 should have yyyy to correspond with modern Excel

[snoopyjc]

The default format for dates in Excel 2010 and newer includes a 4-digit year. So SSF.format(14, new Date(2017, 1, 19)) (or using 'General' format) should be "2/19/2017", not "2/19/17".

[snoopyjc]

Fix:

t[14]= 'm/d/yyyy'

[snoopyjc]

Here is documentation on this. Note there are other related issues mentioned here too: https://docs.microsoft.com/en-us/openspecs/office_standards/ms-oe376/0e59abdb-7f4e-48fc-9b89-67832fa11789

Addl Changes:

    t[22]= 'm/d/yyyy h:mm'
    t[37]= '#,##0_);(#,##0)'   
    t[38]= '#,##0_);[Red](#,##0)'   
    t[39]= '#,##0.00_);(#,##0.00)'  
    t[40]= '#,##0.00_);[Red](#,##0.00)' 
    t[47]= 'mm:ss.0'  

    t[55]: "yyyy/mm/dd"  //ko

[snoopyjc]

Here is an updated implied.json. Note that I use dateNF="m/d/yy" so I didn't change those entries:

[
[1234567890000, [
[0, "1.23457E+12"],
[1, "1234567890000"],
[2, "1234567890000.00"],
[3, "1,234,567,890,000"],
[4, "1,234,567,890,000.00"],
[9, "123456789000000%"],
[10, "123456789000000.00%"],
[11, "1.23E+12"],
[12, "1234567890000 "],
[13, "1234567890000 "],
[14, "##########"],
[15, "##########"],
[16, "##########"],
[17, "##########"],
[18, "##########"],
[19, "##########"],
[20, "##########"],
[21, "##########"],
[22, "##########"],
[37, "1,234,567,890,000 "],
[38, "1,234,567,890,000 "],
[39, "1,234,567,890,000.00 "],
[40, "1,234,567,890,000.00 "],
[45, "##########"],
[46, "##########"],
[47, "##########"],
[48, "1.2E+12"],
[49, "1.23457E+12"]
]],

[123456789000, [
[0, "1.23457E+11"],
[1, "123456789000"],
[2, "123456789000.00"],
[3, "123,456,789,000"],
[4, "123,456,789,000.00"],
[9, "12345678900000%"],
[10, "12345678900000.00%"],
[11, "1.23E+11"],
[12, "123456789000 "],
[13, "123456789000 "],
[14, "##########"],
[15, "##########"],
[16, "##########"],
[17, "##########"],
[18, "##########"],
[19, "##########"],
[20, "##########"],
[21, "##########"],
[22, "##########"],
[37, "123,456,789,000 "],
[38, "123,456,789,000 "],
[39, "123,456,789,000.00 "],
[40, "123,456,789,000.00 "],
[45, "##########"],
[46, "##########"],
[47, "##########"],
[48, "123.5E+9"],
[49, "1.23457E+11"]
]],

[12345678900, [
[0, "12345678900"],
[1, "12345678900"],
[2, "12345678900.00"],
[3, "12,345,678,900"],
[4, "12,345,678,900.00"],
[9, "1234567890000%"],
[10, "1234567890000.00%"],
[11, "1.23E+10"],
[12, "12345678900 "],
[13, "12345678900 "],
[14, "##########"],
[15, "##########"],
[16, "##########"],
[17, "##########"],
[18, "##########"],
[19, "##########"],
[20, "##########"],
[21, "##########"],
[22, "##########"],
[37, "12,345,678,900 "],
[38, "12,345,678,900 "],
[39, "12,345,678,900.00 "],
[40, "12,345,678,900.00 "],
[45, "##########"],
[46, "##########"],
[47, "##########"],
[48, "12.3E+9"],
[49, "12345678900"]
]],

[1234567890, [
[0, "1234567890"],
[1, "1234567890"],
[2, "1234567890.00"],
[3, "1,234,567,890"],
[4, "1,234,567,890.00"],
[9, "123456789000%"],
[10, "123456789000.00%"],
[11, "1.23E+09"],
[12, "1234567890 "],
[13, "1234567890 "],
[14, "##########"],
[15, "##########"],
[16, "##########"],
[17, "##########"],
[18, "##########"],
[19, "##########"],
[20, "##########"],
[21, "##########"],
[22, "##########"],
[37, "1,234,567,890 "],
[38, "1,234,567,890 "],
[39, "1,234,567,890.00 "],
[40, "1,234,567,890.00 "],
[45, "##########"],
[46, "##########"],
[47, "##########"],
[48, "1.2E+9"],
[49, "1234567890"]
]],

[123456789, [
[0, "123456789"],
[1, "123456789"],
[2, "123456789.00"],
[3, "123,456,789"],
[4, "123,456,789.00"],
[9, "12345678900%"],
[10, "12345678900.00%"],
[11, "1.23E+08"],
[12, "123456789 "],
[13, "123456789 "],
[14, "##########"],
[15, "##########"],
[16, "##########"],
[17, "##########"],
[18, "##########"],
[19, "##########"],
[20, "##########"],
[21, "##########"],
[22, "##########"],
[37, "123,456,789 "],
[38, "123,456,789 "],
[39, "123,456,789.00 "],
[40, "123,456,789.00 "],
[45, "##########"],
[46, "##########"],
[47, "##########"],
[48, "123.5E+6"],
[49, "123456789"]
]],

[12345678.9, [
[0, "12345678.9"],
[1, "12345679"],
[2, "12345678.90"],
[3, "12,345,679"],
[4, "12,345,678.90"],
[9, "1234567890%"],
[10, "1234567890.00%"],
[11, "1.23E+07"],
[12, "12345679 "],
[13, "12345678 9/10"],
[14, "##########"],
[15, "##########"],
[16, "##########"],
[17, "##########"],
[18, "##########"],
[19, "##########"],
[20, "##########"],
[21, "##########"],
[22, "##########"],
[37, "12,345,679 "],
[38, "12,345,679 "],
[39, "12,345,678.90 "],
[40, "12,345,678.90 "],
[45, "##########"],
[46, "##########"],
[47, "##########"],
[48, "12.3E+6"],
[49, "12345678.9"]
]],

[1234567.89, [
[0, "1234567.89"],
[1, "1234568"],
[2, "1234567.89"],
[3, "1,234,568"],
[4, "1,234,567.89"],
[9, "123456789%"],
[10, "123456789.00%"],
[11, "1.23E+06"],
[12, "1234567 8/9"],
[13, "1234567 8/9 "],
[14, "2/15/80"],
[15, "15-Feb-80"],
[16, "15-Feb"],
[17, "Feb-80"],
[18, "9:21 PM"],
[19, "9:21:36 PM"],
[20, "21:21"],
[21, "21:21:36"],
[22, "2/15/5280 21:21"],
[37, "1,234,568 "],
[38, "1,234,568 "],
[39, "1,234,567.89 "],
[40, "1,234,567.89 "],
[45, "21:36"],
[46, "29629629:21:36"],
[47, "21:36.0"],
[48, "1.2E+6"],
[49, "1234567.89"]
]],

[123456.789, [
[0, "123456.789"],
[1, "123457"],
[2, "123456.79"],
[3, "123,457"],
[4, "123,456.79"],
[9, "12345679%"],
[10, "12345678.90%"],
[11, "1.23E+05"],
[12, "123456 4/5"],
[13, "123456 15/19"],
[14, "1/3/38"],
[15, "3-Jan-38"],
[16, "3-Jan"],
[17, "Jan-38"],
[18, "6:56 PM"],
[19, "6:56:10 PM"],
[20, "18:56"],
[21, "18:56:10"],
[22, "1/3/2238 18:56"],
[37, "123,457 "],
[38, "123,457 "],
[39, "123,456.79 "],
[40, "123,456.79 "],
[45, "56:10"],
[46, "2962962:56:10"],
[47, "56:09.6"],
[48, "123.5E+3"],
[49, "123456.789"]
]],

[12345.6789, [
[0, "12345.6789"],
[1, "12346"],
[2, "12345.68"],
[3, "12,346"],
[4, "12,345.68"],
[9, "1234568%"],
[10, "1234567.89%"],
[11, "1.23E+04"],
[12, "12345 2/3"],
[13, "12345 55/81"],
[14, "10/18/33"],
[15, "18-Oct-33"],
[16, "18-Oct"],
[17, "Oct-33"],
[18, "4:17 PM"],
[19, "4:17:37 PM"],
[20, "16:17"],
[21, "16:17:37"],
[22, "10/18/1933 16:17"],
[37, "12,346 "],
[38, "12,346 "],
[39, "12,345.68 "],
[40, "12,345.68 "],
[45, "17:37"],
[46, "296296:17:37"],
[47, "17:37.0"],
[48, "12.3E+3"],
[49, "12345.6789"]
]],

[1234.56789, [
[0, "1234.56789"],
[1, "1235"],
[2, "1234.57"],
[3, "1,235"],
[4, "1,234.57"],
[9, "123457%"],
[10, "123456.79%"],
[11, "1.23E+03"],
[12, "1234 4/7"],
[13, "1234 46/81"],
[14, "5/18/03"],
[15, "18-May-03"],
[16, "18-May"],
[17, "May-03"],
[18, "1:37 PM"],
[19, "1:37:46 PM"],
[20, "13:37"],
[21, "13:37:46"],
[22, "5/18/1903 13:37"],
[37, "1,235 "],
[38, "1,235 "],
[39, "1,234.57 "],
[40, "1,234.57 "],
[45, "37:46"],
[46, "29629:37:46"],
[47, "37:45.7"],
[48, "1.2E+3"],
[49, "1234.56789"]
]],

[123.456789, [
[0, "123.456789"],
[1, "123"],
[2, "123.46"],
[3, "123"],
[4, "123.46"],
[9, "12346%"],
[10, "12345.68%"],
[11, "1.23E+02"],
[12, "123 1/2"],
[13, "123 37/81"],
[14, "5/2/00"],
[15, "2-May-00"],
[16, "2-May"],
[17, "May-00"],
[18, "10:57 AM"],
[19, "10:57:47 AM"],
[20, "10:57"],
[21, "10:57:47"],
[22, "5/2/1900 10:57"],
[37, "123 "],
[38, "123 "],
[39, "123.46 "],
[40, "123.46 "],
[45, "57:47"],
[46, "2962:57:47"],
[47, "57:46.6"],
[48, "123.5E+0"],
[49, "123.456789"]
]],

[12.3456789, [
[0, "12.3456789"],
[1, "12"],
[2, "12.35"],
[3, "12"],
[4, "12.35"],
[9, "1235%"],
[10, "1234.57%"],
[11, "1.23E+01"],
[12, "12 1/3"],
[13, "12 28/81"],
[14, "1/12/00"],
[15, "12-Jan-00"],
[16, "12-Jan"],
[17, "Jan-00"],
[18, "8:17 AM"],
[19, "8:17:47 AM"],
[20, "8:17"],
[21, "8:17:47"],
[22, "1/12/1900 8:17"],
[37, "12 "],
[38, "12 "],
[39, "12.35 "],
[40, "12.35 "],
[45, "17:47"],
[46, "296:17:47"],
[47, "17:46.7"],
[48, "12.3E+0"],
[49, "12.3456789"]
]],

[1.23456789, [
[0, "1.23456789"],
[1, "1"],
[2, "1.23"],
[3, "1"],
[4, "1.23"],
[9, "123%"],
[10, "123.46%"],
[11, "1.23E+00"],
[12, "1 1/4"],
[13, "1 19/81"],
[14, "1/1/00"],
[15, "1-Jan-00"],
[16, "1-Jan"],
[17, "Jan-00"],
[18, "5:37 AM"],
[19, "5:37:47 AM"],
[20, "5:37"],
[21, "5:37:47"],
[22, "1/1/1900 5:37"],
[37, "1 "],
[38, "1 "],
[39, "1.23 "],
[40, "1.23 "],
[45, "37:47"],
[46, "29:37:47"],
[47, "37:46.7"],
[48, "1.2E+0"],
[49, "1.23456789"]
]],

[0.123456789, [
[0, "0.123456789"],
[1, "0"],
[2, "0.12"],
[3, "0"],
[4, "0.12"],
[9, "12%"],
[10, "12.35%"],
[11, "1.23E-01"],
[12, " 1/8"],
[13, " 10/81"],
[14, "1/0/00"],
[15, "0-Jan-00"],
[16, "0-Jan"],
[17, "Jan-00"],
[18, "2:57 AM"],
[19, "2:57:47 AM"],
[20, "2:57"],
[21, "2:57:47"],
[22, "1/0/1900 2:57"],
[37, "0 "],
[38, "0 "],
[39, "0.12 "],
[40, "0.12 "],
[45, "57:47"],
[46, "2:57:47"],
[47, "57:46.7"],
[48, "123.5E-3"],
[49, "0.123456789"]
]],

[0.0123456789, [
[0, "0.012345679"],
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[3, "0"],
[4, "0.01"],
[9, "1%"],
[10, "1.23%"],
[11, "1.23E-02"],
[12, "0 "],
[13, " 1/81"],
[14, "1/0/00"],
[15, "0-Jan-00"],
[16, "0-Jan"],
[17, "Jan-00"],
[18, "12:17 AM"],
[19, "12:17:47 AM"],
[20, "0:17"],
[21, "0:17:47"],
[22, "1/0/1900 0:17"],
[37, "0 "],
[38, "0 "],
[39, "0.01 "],
[40, "0.01 "],
[45, "17:47"],
[46, "0:17:47"],
[47, "17:46.7"],
[48, "12.3E-3"],
[49, "0.012345679"]
]],

[0.00123456789, [
[0, "0.001234568"],
[1, "0"],
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[3, "0"],
[4, "0.00"],
[9, "0%"],
[10, "0.12%"],
[11, "1.23E-03"],
[12, "0 "],
[13, "0 "],
[14, "1/0/00"],
[15, "0-Jan-00"],
[16, "0-Jan"],
[17, "Jan-00"],
[18, "12:01 AM"],
[19, "12:01:47 AM"],
[20, "0:01"],
[21, "0:01:47"],
[22, "1/0/1900 0:01"],
[37, "0 "],
[38, "0 "],
[39, "0.00 "],
[40, "0.00 "],
[45, "01:47"],
[46, "0:01:47"],
[47, "01:46.7"],
[48, "1.2E-3"],
[49, "0.001234568"]
]],

[0.000123456789, [
[0, "0.000123457"],
[1, "0"],
[2, "0.00"],
[3, "0"],
[4, "0.00"],
[9, "0%"],
[10, "0.01%"],
[11, "1.23E-04"],
[12, "0 "],
[13, "0 "],
[14, "1/0/00"],
[15, "0-Jan-00"],
[16, "0-Jan"],
[17, "Jan-00"],
[18, "12:00 AM"],
[19, "12:00:11 AM"],
[20, "0:00"],
[21, "0:00:11"],
[22, "1/0/1900 0:00"],
[37, "0 "],
[38, "0 "],
[39, "0.00 "],
[40, "0.00 "],
[45, "00:11"],
[46, "0:00:11"],
[47, "00:10.7"],
[48, "123.5E-6"],
[49, "0.000123457"]
]],

[0.0000123456789, [
[0, "1.23457E-05"],
[1, "0"],
[2, "0.00"],
[3, "0"],
[4, "0.00"],
[9, "0%"],
[10, "0.00%"],
[11, "1.23E-05"],
[12, "0 "],
[13, "0 "],
[14, "1/0/00"],
[15, "0-Jan-00"],
[16, "0-Jan"],
[17, "Jan-00"],
[18, "12:00 AM"],
[19, "12:00:01 AM"],
[20, "0:00"],
[21, "0:00:01"],
[22, "1/0/1900 0:00"],
[37, "0 "],
[38, "0 "],
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[40, "0.00 "],
[45, "00:01"],
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[47, "00:01.1"],
[48, "12.3E-6"],
[49, "1.23457E-05"]
]],

[0.00000123456789, [
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[3, "0"],
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[10, "0.00%"],
[11, "1.23E-06"],
[12, "0 "],
[13, "0 "],
[14, "1/0/00"],
[15, "0-Jan-00"],
[16, "0-Jan"],
[17, "Jan-00"],
[18, "12:00 AM"],
[19, "12:00:00 AM"],
[20, "0:00"],
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[22, "1/0/1900 0:00"],
[37, "0 "],
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[40, "0.00 "],
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]],

[0.000000123456789, [
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[10, "0.00%"],
[11, "1.23E-07"],
[12, "0 "],
[13, "0 "],
[14, "1/0/00"],
[15, "0-Jan-00"],
[16, "0-Jan"],
[17, "Jan-00"],
[18, "12:00 AM"],
[19, "12:00:00 AM"],
[20, "0:00"],
[21, "0:00:00"],
[22, "1/0/1900 0:00"],
[37, "0 "],
[38, "0 "],
[39, "0.00 "],
[40, "0.00 "],
[45, "00:00"],
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[48, "123.5E-9"],
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[16, "0-Jan"],
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[18, "12:00 AM"],
[19, "12:00:00 AM"],
[20, "0:00"],
[21, "0:00:00"],
[22, "1/0/1900 0:00"],
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]],

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[12, "0 "],
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[15, "0-Jan-00"],
[16, "0-Jan"],
[17, "Jan-00"],
[18, "12:00 AM"],
[19, "12:00:00 AM"],
[20, "0:00"],
[21, "0:00:00"],
[22, "1/0/1900 0:00"],
[37, "0 "],
[38, "0 "],
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]],

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]],

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[10, "-1234567.89%"],
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[12, "-12345 2/3"],
[13, "-12345 55/81"],
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[45, "##########"],
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]],

[11.666666666666666, 0, "11.66666667"],
[5.057996968497839, 0, "5.057996968"],
[4.380353866983808, 0, "4.380353867"],
[12.333333333333343, 0, "12.33333333"],
[-0.000006211546860868111, 0, "-6.21155E-06"],
[12345.67876, 47, "17:24.9"],
[0, 0, "0"]
]

[SheetJSDev]

What are your computer regional settings?

On a mac set to New York, NY, USA, I generated the following file: fmt14.xlsx

A1=TODAY()

The format is using code 14:

[snoopyjc]