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188 lines
5 KiB
Markdown
188 lines
5 KiB
Markdown
# datetime
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Simple helper to help parse date strings into `Date`, with additional functions.
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## Usage
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The following symbols from
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[unicode LDML](http://www.unicode.org/reports/tr35/tr35-dates.html#Date_Field_Symbol_Table)
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are supported:
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- `yyyy` - numeric year.
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- `yy` - 2-digit year.
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- `M` - numeric month.
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- `MM` - 2-digit month.
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- `d` - numeric day.
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- `dd` - 2-digit day.
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- `H` - numeric hour (0-23 hours).
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- `HH` - 2-digit hour (00-23 hours).
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- `h` - numeric hour (1-12 hours).
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- `hh` - 2-digit hour (01-12 hours).
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- `m` - numeric minute.
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- `mm` - 2-digit minute.
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- `s` - numeric second.
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- `ss` - 2-digit second.
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- `S` - 1-digit fractionalSecond.
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- `SS` - 2-digit fractionalSecond.
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- `SSS` - 3-digit fractionalSecond.
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- `a` - dayPeriod, either `AM` or `PM`.
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- `'foo'` - quoted literal.
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- `./-` - unquoted literal.
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## Methods
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### parse
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Takes an input `string` and a `formatString` to parse to a `date`.
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```ts
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import { parse } from 'https://deno.land/std@0.69.0/datetime/mod.ts'
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parse("20-01-2019", "dd-MM-yyyy") // output : new Date(2019, 0, 20)
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parse("2019-01-20", "yyyy-MM-dd") // output : new Date(2019, 0, 20)
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parse("2019-01-20", "dd.MM.yyyy") // output : new Date(2019, 0, 20)
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parse("01-20-2019 16:34", "MM-dd-yyyy HH:mm") // output : new Date(2019, 0, 20, 16, 34)
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parse("01-20-2019 04:34 PM", "MM-dd-yyyy hh:mm a") // output : new Date(2019, 0, 20, 16, 34)
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parse("16:34 01-20-2019", "HH:mm MM-dd-yyyy") // output : new Date(2019, 0, 20, 16, 34)
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parse("01-20-2019 16:34:23.123", "MM-dd-yyyy HH:mm:ss.SSS") // output : new Date(2019, 0, 20, 16, 34, 23, 123)
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...
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```
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### format
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Takes an input `date` and a `formatString` to format to a `string`.
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```ts
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import { format } from "https://deno.land/std@$STD_VERSION/datetime/mod.ts";
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format(new Date(2019, 0, 20), "dd-MM-yyyy"); // output : "20-01-2019"
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format(new Date(2019, 0, 20), "yyyy-MM-dd"); // output : "2019-01-20"
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format(new Date(2019, 0, 20), "dd.MM.yyyy"); // output : "2019-01-20"
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format(new Date(2019, 0, 20, 16, 34), "MM-dd-yyyy HH:mm"); // output : "01-20-2019 16:34"
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format(new Date(2019, 0, 20, 16, 34), "MM-dd-yyyy hh:mm a"); // output : "01-20-2019 04:34 PM"
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format(new Date(2019, 0, 20, 16, 34), "HH:mm MM-dd-yyyy"); // output : "16:34 01-20-2019"
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format(new Date(2019, 0, 20, 16, 34, 23, 123), "MM-dd-yyyy HH:mm:ss.SSS"); // output : "01-20-2019 16:34:23.123"
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format(new Date(2019, 0, 20), "'today:' yyyy-MM-dd"); // output : "today: 2019-01-20"
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```
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### dayOfYear
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Returns the number of the day in the year.
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```ts
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import { dayOfYear } from "https://deno.land/std@$STD_VERSION/datetime/mod.ts";
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dayOfYear(new Date("2019-03-11T03:24:00")); // output: 70
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```
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### weekOfYear
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Returns the ISO week number of the provided date (1-53).
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```ts
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import { weekOfYear } from "https://deno.land/std@$STD_VERSION/datetime/mod.ts";
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weekOfYear(new Date("2020-12-28T03:24:00")); // Returns 53
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```
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### toIMF
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Formats the given date to IMF date time format. (Reference:
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https://tools.ietf.org/html/rfc7231#section-7.1.1.1 )
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```js
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import { toIMF } from "https://deno.land/std@$STD_VERSION/datetime/mod.ts";
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toIMF(new Date(0)); // => returns "Thu, 01 Jan 1970 00:00:00 GMT"
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```
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### isLeap
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Returns true if the given date or year (in number) is a leap year. Returns false
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otherwise.
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```js
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import { isLeap } from "https://deno.land/std@$STD_VERSION/datetime/mod.ts";
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isLeap(new Date("1970-01-01")); // => returns false
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isLeap(new Date("1972-01-01")); // => returns true
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isLeap(new Date("2000-01-01")); // => returns true
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isLeap(new Date("2100-01-01")); // => returns false
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isLeap(1972); // => returns true
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```
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### difference
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Returns the difference of the 2 given dates in the given units. If the units are
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omitted, it returns the difference in the all available units.
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Available units: "milliseconds", "seconds", "minutes", "hours", "days", "weeks",
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"months", "quarters", "years"
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```js
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import { difference } from "https://deno.land/std@$STD_VERSION/datetime/mod.ts";
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const date0 = new Date("2018-05-14");
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const date1 = new Date("2020-05-13");
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difference(date0, date1, { units: ["days", "months", "years"] });
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// => returns { days: 730, months: 23, years: 1 }
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difference(date0, date1);
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// => returns {
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// milliseconds: 63072000000,
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// seconds: 63072000,
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// minutes: 1051200,
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// hours: 17520,
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// days: 730,
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// weeks: 104,
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// months: 23,
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// quarters: 5,
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// years: 1
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// }
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```
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## Constants
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### SECOND
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```
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import { SECOND } from "https://deno.land/std@$STD_VERSION/datetime/mod.ts";
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console.log(SECOND); // => 1000
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```
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### MINUTE
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```
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import { MINUTE } from "https://deno.land/std@$STD_VERSION/datetime/mod.ts";
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console.log(MINUTE); // => 60000 (60 * 1000)
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```
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### HOUR
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```
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import { HOUR } from "https://deno.land/std@$STD_VERSION/datetime/mod.ts";
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console.log(HOUR); // => 3600000 (60 * 60 * 1000)
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```
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### DAY
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```
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import { DAY } from "https://deno.land/std@$STD_VERSION/datetime/mod.ts";
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console.log(DAY); // => 86400000 (24 * 60 * 60 * 1000)
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```
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### WEEK
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```
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import { WEEK } from "https://deno.land/std@$STD_VERSION/datetime/mod.ts";
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console.log(WEEK); // => 604800000 (7 * 24 * 60 * 60 * 1000)
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```
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