extended-date

//               Standar methods
.getDate
.getDay
.getFullYear
.getHours
.getMilliseconds
.getMinutes
.getMonth
.getSeconds
.getTime
.toJSON
.valueOfsetDate

//              Setting methods are chainable
.setFullYear
.setHours
.setMilliseconds
.setMinutes
.setMonth
.setSeconds
.setTime
**/

|Getters and Setters| |-------------------| |year | |month | |date | |hours | |minutes | |seconds | |milliseconds | |time |

let a = new DateTime(2014, 0, 1);

a.year = 2015;
a.year          //2015

|Diffs (DateTime)| |---------| |diffYears| |diffMonths| |diffDays| |diffHours| |diffMinutes| |diffSeconds| |diffMilliseconds|

|Diff in (DateTime, round down)| |---| |diffInYears| |diffInMonths| |diffInDays| |diffInHours| |diffInMinutes| |diffInSeconds| |diffInMilliseconds|

let a = new DateTime(2014, 0, 1),
    b = new DateTime(2015, 1, 1);

a.diffMonths(b)         //1
a.diffInMonths(b)       //13.02...
a.diffInYears(b)        //1.08...
a.diffInYears(b, true)) //1 (round down)
b.diffInYears(a, true)) //-1 (round up)

|add/sub (year, month, day, ...) like in setFullYear, setMonths, ...| |----| |addYears| |addMonths| |addDays| |addHours| |addMinutes| |addSeconds| |addMilliseconds|

|other| |---| |format| |clone| |toDate| |toUTCDate| |toUTC| |getDayOfYear| |setDayOfYear(day, min, sec, ...)|

##DateTime statics

|methods| |---| |now| |get => new DateTime()| |getUTC| |today => DateTime.get().setHours(0, 0, 0, 0)| |todayUTC => DateTime.getUTC().setHours(0, 0, 0, 0)| |locale - see below| |format - see below|

DataTime.locale(lang)      //set lang
DataTime.locale(lang, definition) //add locale

//definition
{
    'ampm': 'am,pm'.split(','),
    'monthsLong': 'January,February,March,April,May,June,July,August,September,October,November,December'.split(','),
    'monthsShort': 'Jan,Feb,Mar,Apr,May,Jun,Jul,Aug,Sep,Oct,Nov,Dec'.split(','),
    'daysLong': 'Sunday,Monday,Tuesday,Wednesday,Thursday,Friday,Saturday'.split(','),
    'daysShort': 'Sun,Mon,Tue,Wed,Thu,Fri,Sat'.split(',')
}

DateTime.get().format('{yyyy}-{MM}-{dd}')   //2017-02-20
//format strings like here: https://docs.angularjs.org/api/ng/filter/date