#timestring.js

timestring.js attempts to parse a human readable time string into a time based value.

##Overview

var str = '1h 15m';
var time = str.parseTime(); 

console.log(time); // will log 4500

In the example above str is just a plain old String object. timestring.js adds a new method to the String objects prototype named parseTime. This method parses the string and returns a time based value.

By default the returned time value will be in seconds.

The time string can contain as many time groups as needed:

var str = '1d 3h 25m 18s';
var time = str.parseTime(); 

console.log(time); // will log 98718

and can be as messy as you like:

var str = '1 d    3h 25              m         1   8s';
var time = str.parseTime(); 

console.log(time); // will log 98718

As well as using the String objects parseTime method you can create a Timestring object and parse the string manually:

var str = '1h 15m';
var time = (new Timestring()).parse(str);

console.log(time); // will log 4500

##Keywords

timestring.js will parse the following keywords into time values:

1. s, sec, secs, second, seconds - will parse to seconds
2. m, min, mins, minute, minutes - will parse to minutes
3. h, hr, hrs, hour, hours - will parse to hours
4. d, day, days - will parse to days
5. w, week, weeks - will parse to weeks
6. mth, mths, month, months - will parse to months
7. y, yr, yrs, year, years - will parse to years

Keywords can be used interchangeably:

var str = '1day 15h 20minutes 15s';
var time = str.parseTime();

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 String.parseTime or Timestring.parse:

1. s - Seconds
2. m - Minutes
3. h - Hours
4. d - Days
5. w - Weeks
6. mth - Months
7. y - Years

var str = '22h 16m';

var hours = str.parseTime('h'); // 22.266666666666666 
var days = str.parseTime('d'); // 0.9277777777777778 
var weeks = str.parseTime('w'); // 0.13253968253968254

// or

var hours = (new Timestring()).parse(str, 'h'); // 22.266666666666666 
var days = (new Timestring()).parse(str, 'd'); // 0.9277777777777778 
var weeks = (new Timestring()).parse(str, 'w'); // 0.13253968253968254

##Optional Configuration

timestring.js makes a few assumptions:

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 settings can be changed by passing a settings object as an argument to String.parseTime or to the Timestring objects constructor.

The following settings are configurable:

1. hoursPerDay
2. daysPerWeek
3. weeksPerMonth
4. monthsPerYear

var str = '1d';

var settings = {
	hoursPerDay: 1
}

var time = str.parseTime('h', settings);

// or 

var time = (new Timestring(settings)).parse(str, 'h');


console.log(time) // will log 1

In the example of 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 deafult 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.

var settings = {
	hoursPerDay: 7.5,
	daysPerWeek: 5
}

// get time values from form input
var today = document.querySelector('time-input').value,  // '1d'
	thisWeek = document.querySelector('time-input').value // '1w';

// parse times
var hoursToday = today.parseTime('h', settings),
	daysThisWeek = thisWeek.parseTime('d', settings);

// or 

var hoursToday = (new Timestring(settings)).parse(today, 'h'),
	daysThisWeek = (new Timestring(settings)).parse(thisWeek, 'd')


console.log(hoursToday) // will log 7.5
console.log(daysThisWeek) // will log 5