31 lines
1.1 KiB
Markdown
31 lines
1.1 KiB
Markdown
---
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title: toISOStringWithTimezone
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tags: date,intermediate
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---
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Converts a date to extended ISO format (ISO 8601), including timezone offset.
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- Use `Date.prototype.getTimezoneOffset()` to get the timezone offset and reverse it, storing its sign in `diff`.
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- Define a helper function, `pad`, that normalizes any passed number to an integer using `Math.floor()` and `Math.abs()` and pads it to `2` digits, using `String.prototype.padStart()`.
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- Use `pad()` and the built-in methods in the `Date` prototype to build the ISO 8601 string with timezone offset.
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```js
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const toISOStringWithTimezone = date => {
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const tzOffset = -date.getTimezoneOffset();
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const diff = tzOffset >= 0 ? '+' : '-';
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const pad = n => `${Math.floor(Math.abs(n))}`.padStart(2, '0');
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return date.getFullYear() +
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'-' + pad(date.getMonth() + 1) +
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'-' + pad(date.getDate()) +
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'T' + pad(date.getHours()) +
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':' + pad(date.getMinutes()) +
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':' + pad(date.getSeconds()) +
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diff + pad(tzOffset / 60) +
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':' + pad(tzOffset % 60);
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};
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```
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```js
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toISOStringWithTimezone(new Date()); // '2020-10-06T20:43:33-04:00'
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```
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