timestring/README.md
2016-11-15 09:37:20 -08:00

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# Timestring
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Parse a human readable time string into a time based value.
## Installation
```bash
npm install --save timestring
```
## Usage
### Overview
```js
var timestring = require('timestring');
var str = '1h 15m';
var time = timestring(str);
console.log(time); // will log 4500
```
**By default the returned time value from `timestring` will be in seconds.**
The time string can contain as many time groups as needed:
```js
var str = '1d 3h 25m 18s';
var time = timestring(str);
console.log(time); // will log 98718
```
and can be as messy as you like:
```js
var str = '1 d 3HOurS 25 min 1 8s';
var time = timestring(str);
console.log(time); // will log 98718
```
### Keywords
Timestring will parse the following keywords into time values:
1. `ms, milli, millisecond, milliseconds` - will parse to milliseconds
2. `s, sec, secs, second, seconds` - will parse to seconds
3. `m, min, mins, minute, minutes` - will parse to minutes
4. `h, hr, hrs, hour, hours` - will parse to hours
5. `d, day, days` - will parse to days
6. `w, week, weeks` - will parse to weeks
7. `mon, mth, mths, month, months` - will parse to months
8. `y, yr, yrs, year, years` - will parse to years
Keywords can be used interchangeably:
```js
var str = '1day 15h 20minutes 15s';
var time = timestring(str);
console.log(time); // will log 141615
```
### Return Time Value
By default the return time value will be in seconds. This can be changed by passing one of the following strings as an argument to `timestring`:
1. `ms` - Milliseconds
2. `s` - Seconds
3. `m` - Minutes
4. `h` - Hours
5. `d` - Days
6. `w` - Weeks
7. `mth` - Months
8. `y` - Years
```js
var str = '22h 16m';
var hours = timestring(str, 'h'); // 22.266666666666666
var days = timestring(str, 'd'); // 0.9277777777777778
var weeks = timestring(str, 'w'); // 0.13253968253968254
```
### Optional Configuration
A few assumptions are made by default:
1. There are 24 hours per day
2. There are 7 days per week
3. There are 4 weeks per month
4. There are 12 months per year
These options can be changed by passing an options object as an argument to `timestring`.
The following options are configurable:
1. `hoursPerDay`
2. `daysPerWeek`
3. `weeksPerMonth`
4. `monthsPerYear`
```js
var str = '1d';
var opts = {
hoursPerDay: 1
}
var time = timestring(str, 'h', opts);
console.log(time); // will log 1
```
In the example above `hoursPerDay` is being set to `1`. When the time string is being parsed, the return value is being specified as hours. Normally `1d` would parse to `24` hours (as by default there are 24 hours in a day) but because `hoursPerDay` has been set to `1`, `1d` will now only parse to `1` hour.
This would be useful for specific application needs.
*Example - Employees of my company work 7.5 hours a day, and only work 5 days a week. In my time tracking app, when they type `1d` i want 7.5 hours to be tracked. When they type `1w` i want 5 days to be tracked etc.*
```js
var opts = {
hoursPerDay: 7.5,
daysPerWeek: 5
}
var hoursToday = timestring('1d', 'h', opts);
var daysThisWeek = timestring('1w', 'd', opts);
console.log(hoursToday); // will log 7.5
console.log(daysThisWeek); // will log 5
```