@web-atoms/date-time

Immutable DateTime library for Web Atoms in JavaScript similar to .Net DateTime and TimeSpan

Features

1. Immutable DateTime
2. Support for TimeSpan (differences between dates)
3. Simple Add/Difference
4. Support for properties
5. Support for Comparison
6. Support for valueOf which makes it easier to compare and sort dates
7. Backward compatibility with JavaScript's Date

Compatibility

In order to make usage simple, you can pass DateTime to any method that uses Date and everything will still work. To prevent intellisense from listing all Date's methods, we have used a hack to create new Date object in constructor of DateTime.

For easy access, all to*String methods of Date are available in intellisense.

   const d = DateTime.now();
   console.log(d instance of Date); // prints true..

   // however intellisense does not
   // show up for Date methods except for toLocaleDateString etc
   d.year

Usage

Properties

Year, Month, Day, Hour, Minute, Second and Millisecond are all properties.

   const d = DateTime.now();

   console.log(`${d.year}-${d.month}-${d.day}`);

Trim Time

   const d = DateTime.now();

   // returns new instance of DateTime
   // with time part trimmed...
   const day = d.date;

Comparison

   const d1 = new DateTime(2010, 1, 1, 20, 50);
   const d2 = new DateTime(2010, 2, 1, 20, 50);
   const dt1 = new Date(d1.msSinceEpoch);
   const dt2 = new Date(d1.msSinceEpoch);
   // DateTime comparison works correctly
   Assert.isTrue(d1 < d2);
   // Date comparison does not work as expected
   Assert.isFalse(dt1 < dt2);

TimeSpan

   const d = DateTime.now();

   const t = d.time;

   console.log(t); // prints 10.00 PM (local time)

Difference in TimeSpan

   const d1 = new DateTime(2010, 1, 1);
   const d2 = new DateTime(2012, 1, 1);

   // returns TimeSpan
   const diff = d2.diff(d1);

   // prints 730
   console.log(diff.totalDays);

Add TimeSpan

   
   const t = TimeSpan.fromDays(2);
   const d1 = new DateTime(2010, 1, 1);

   const d2 = d1.add(t);

   // prints 2010-01-03
   console.log(d2);