2017-03-20 09:02:25 +00:00
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#### Data Types
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The raw value is stored in the `v` field, interpreted based on the `t` field.
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Type `b` is the Boolean type. `v` is interpreted according to JS truth tables.
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Type `e` is the Error type. `v` holds the number and `w` holds the common name:
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2017-04-30 20:37:53 +00:00
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<details>
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<summary><b>Error values and interpretation</b> (click to show)</summary>
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2017-03-20 09:02:25 +00:00
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| Value | Error Meaning |
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| -----: | :-------------- |
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| `0x00` | `#NULL!` |
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| `0x07` | `#DIV/0!` |
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| `0x0F` | `#VALUE!` |
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| `0x17` | `#REF!` |
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| `0x1D` | `#NAME?` |
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| `0x24` | `#NUM!` |
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| `0x2A` | `#N/A` |
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| `0x2B` | `#GETTING_DATA` |
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2017-04-30 20:37:53 +00:00
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</details>
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2017-03-20 09:02:25 +00:00
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Type `n` is the Number type. This includes all forms of data that Excel stores
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as numbers, such as dates/times and Boolean fields. Excel exclusively uses data
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that can be fit in an IEEE754 floating point number, just like JS Number, so the
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`v` field holds the raw number. The `w` field holds formatted text. Dates are
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stored as numbers by default and converted with `XLSX.SSF.parse_date_code`.
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Type `d` is the Date type, generated only when the option `cellDates` is passed.
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Since JSON does not have a natural Date type, parsers are generally expected to
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store ISO 8601 Date strings like you would get from `date.toISOString()`. On
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the other hand, writers and exporters should be able to handle date strings and
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JS Date objects. Note that Excel disregards timezone modifiers and treats all
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dates in the local timezone. js-xlsx does not correct for this error.
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Type `s` is the String type. `v` should be explicitly stored as a string to
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avoid possible confusion.
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Type `z` represents blank stub cells. These do not have any data or type, and
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are not processed by any of the core library functions. By default these cells
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will not be generated; the parser `sheetStubs` option must be set to `true`.
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2017-03-21 20:44:35 +00:00
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#### Dates
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By default, Excel stores dates as numbers with a format code that specifies date
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processing. For example, the date `19-Feb-17` is stored as the number `42785`
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with a number format of `d-mmm-yy`. The `SSF` module understands number formats
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and performs the appropriate conversion.
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XLSX also supports a special date type `d` where the data is an ISO 8601 date
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string. The formatter converts the date back to a number.
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The default behavior for all parsers is to generate number cells. Setting
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`cellDates` to true will force the generators to store dates.
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