3 A simple implementation of TimeSpans in Javascript.
5 ## Installation in node.js
7 ### Installing npm (node package manager)
9 $ curl http://npmjs.org/install.sh | sh
12 ### Installing timespan
14 [sudo] npm install timespan
18 You have two options when creating a new TimeSpan object: either explicitly instantiate it using the TimeSpan constructor function or use a helper method to create from a specific length of time.
20 ### Using the new constructor
23 var timespan = require('timespan');
24 var ts = new timespan.TimeSpan();
27 The constructor takes 5 parameters, all which are optional and which can be used to initialize the TimeSpan to a given value. These parameters are: `milliseconds`, `seconds`, `minutes`, `hours`, `days`.
31 // Initializes the TimeSpan to 4 Minutes, 16 Seconds and 0 Milliseconds.
33 var ts = new TimeSpan(0,16,4)
36 // Initializes the TimeSpan to 3 hours, 4 minutes, 10 seconds and 0 msecs.
38 var ts = new TimeSpan(0,10,64,2);
41 ### Using Construction Helper Method(s)
42 You can initialize a new TimeSpan by calling one of these Functions:
45 timespan.FromSeconds(/* seconds */);
46 timespan.FromMinutes(/* minutes */);
47 timespan.FromHours(/* hours */);
48 timespan.FromDays(/* hours */);
51 // This behaves differently, see below
53 timespan.FromDates(start, end);
56 The first four helper methods take a single numeric parameter and create a new TimeSpan instance. e.g. `timespan.FromSeconds(45)` is equivalent to `new TimeSpan(0,45)`. If the parameter is invalid/not a number, it will just be treated as 0 no error will be thrown.
58 `timespan.FromDates()` is different as it takes two dates. The TimeSpan will be the difference between these dates.
60 If the second date is earlier than the first date, the TimeSpan will have a negative value. You can pass in "true" as the third parameter to force the TimeSpan to be positive always.
63 var date1 = new Date(2010, 3, 1, 10, 10, 5, 0);
64 var date2 = new Date(2010, 3, 1, 10, 10, 10, 0);
65 var ts = TimeSpan.FromDates(date2, date1);
66 var ts2 = TimeSpan.FromDates(date2, date1, true);
69 // -5, because we put the later date first
71 console.log(ts.totalSeconds());
74 // 5, because we passed true as third parameter
76 console.log(ts2.totalSeconds());
80 ### Adding / Subtracting TimeSpans
81 There are several functions to add or subtract time:
89 ts.subtractMilliseconds()
96 All these functions take a single numeric parameter. If the parameter is invalid, not a number, or missing it will be ignored and no Error is thrown.
99 var ts = new TimeSpan();
102 ts.subtractSeconds(60);
105 // ts will now be a timespan of 1 minute and 30 seconds
109 The parameter can be negative to negate the operation `ts.addSeconds(-30)` is equivalent to `ts.subtractSeconds(30)`.
111 ### Interacting with Other TimeSpan instances
112 These are the functions that interact with another TimeSpan:
120 add and subtract add/subtract the other TimeSpan to the current one:
123 var ts = TimeSpan.FromSeconds(30);
124 var ts2 = TimeSpan.FromMinutes(2);
128 // ts is now a TimeSpan of 2 Minutes, 30 Seconds
133 equals checks if two TimeSpans have the same time:
136 var ts = TimeSpan.FromSeconds(30);
137 var ts2 = TimeSpan.FromSeconds(30);
138 var eq = ts.equals(ts2); // true
140 var eq2 = ts.equals(ts2); // false
143 ### Retrieving the Value of a TimeSpan
144 There are two sets of functions to retreive the function of the TimeSpan: those that deal with the full value in various measurements and another that gets the individual components.
146 #### Retrieve the full value
149 ts.totalMilliseconds()
156 These functions convert the value to the given format and return it. The result can be a floating point number. These functions take a single parameter roundDown which can be set to true to round the value down to an Integer.
159 var ts = TimeSpan.fromSeconds(90);
160 console.log(ts.totalMilliseconds()); // 90000
161 console.log(ts.totalSeconds()); // 90
162 console.log(ts.totalMinutes()); // 1.5
163 console.log(ts.totalMinutes(true)); // 1
166 #### Retrieve a component of the TimeSpan
176 These functions return a component of the TimeSpan that could be used to represent a clock.
179 var ts = TimeSpan.FromSeconds(90);
180 console.log(ts.seconds()); // 30
181 console.log(ts.minutes()); // 1
184 Basically these value never "overflow" - seconds will only return 0 to 59, hours only 0 to 23 etc. Days could grow infinitely. All of these functions automatically round down the result:
187 var ts = TimeSpan.FromDays(2);
189 console.log(ts.days()); // 2
190 console.log(ts.hours()); // 12
193 ## Remark about Backwards Compatibility
194 Version 0.2.x was designed to work with [node.js][0] and backwards compatibility to the browser-based usage was not considered a high priority. This will be fixed in future versions, but for now if you need to use this in the browser, you can find the 0.1.x code under `/browser`.
196 #### Author: [Michael Stum](http://www.stum.de)
197 #### Contributors: [Charlie Robbins](http://github.com/indexzero)
199 [0]: http://nodejs.org