Working with DateTime in JavaScript

<script type="text/javascript">
    //Get the current date and time stamp.
    var date = DateTime.now();
    //Add 100 hours to the date
    date = date.addHours(100);
    //Write the date in a formatted fashion: Monday, 15/Feb/2012
    document.writeline("dddd, dd/MMM/yyyy");
</script>

DateTime Class

Constructor	Description
DateTime(millseconds : int)	Creates a DateTime starting from the specified amount of millseconds
DateTime(year : int, month : int, day : int)	For the specified date elements
DateTime(year : int, month : int, day : int, hour : int, minute : int, second : int)	For the specified date and time elements
DateTime(year : int, month : int, day : int, hour : int, minute : int, second : int)	Creates a DateTime for the specified date and time (with milliseconds) elements

Static Method	Return Value	Description
DateTime.daysInMonth(year : int, month : int)	int	Returns the days of the specified month for the specified year
DateTime.isLeapYear(year : int)	bool	Returns a boolean indicating if the specified year is leap year (February has 29 days)
DateTime.now()	DateTime	Returns the current date and time
DateTime.today()	DateTime	Returns the current date, with zero time
DateTime.utcNow()	DateTime	Returns the UTC (Previously called GMT) time

Method	Return Value	Description
add(time : TimeSpan)	DateTime	Adds the specified time to the date and returns the result
addDays(days : int)	DateTime	Adds the specified number of days to the date and returns the result
addHours(hours : int)	DateTime	Adds the specified number of hours to the date and returns the result
addMilliseconds(millis : int)	DateTime	Adds the specified number of milliseconds to the date and returns the result
addMinutes(minutes: int)	DateTime	Adds the specified number of minutes to the date and returns the result
addMonths(months : int)	DateTime	Adds the specified number of months to the date and returns the result
addSeconds(seconds : int)	DateTime	Adds the specified number of seconds to the date and returns the result
addYears(years : int)	DateTime	Adds the specified number of years to the date and returns the result
compareTo(d : DateTime)	int	Returns -1, 0 or 1, depending on the compare result
date()	DateTime	Returns just the date, with no time
day()	int	Returns the day of the date
dayOfWeek()	int	Returns the day of week. 1 = Monday to 7 = Sunday
dayOfYear()	int	Returns the day of year
equals(d : DateTime)	bool	Returns a value indicating if d is the same date
format(format : string)	string	Returns a formatted date. Format is very similar to .NET's date time custom formatting: d - Day of month, 1 to 31 dd - Day of Month, 01 to 31 ddd - Day of Week, Mon to Sun dddd - Day of Week, Monday to Sunday f - Millisecond / 100 ff - Millisecond / 10 fff - Millisecond h - Hour of day, 1 to 12 hh - Hour of day, 01 to 12 H - Hour of day, 1 to 23 HH - Hour of day, 01 to 24 m - Minute, 1 to 59 mm - Minute, 01 to 59 M - Month, 1 to 12 MM - Month, 01 to 12 MMM - Month, Jan to Dec MMMM - Month, January to December s - Second, 1 to 59 ss - Second 01 to 59 t - A or P tt - AM or PM yy - Year, 10 yyyy - Year, 2010 : - TimeSeparator / - DateSeparator
hour()	int	Gets the hour of the date
millisecond()	int	Gets the millisecond of the date
minute()	int	Gets the minute of the date
month()	int	Gets the month of the date
second()	int	Gets the second of the date
subtractDate(d : DateTime)	TimeSpan	Subtracts the specified DateTime and returns the resultTimeSpan
subtractTime(t : TimeSpan)	DateTime	Subtracts the specified TimeSpan and returns the resultDateTime
timeOfDay()	TimeSpan	Gets just the time part of the date
year()	int	Gets the year of the date

Translation Strings

You may translate the strings of the class by changing the values of the following static properties:

Property	Default Value
DateTme.strings.Mon	Mon
DateTme.strings.Monday	Monday
DateTme.strings.Tue	Tue
DateTme.strings.Tuesday	Tuesday
DateTme.strings.Wed	Wed
DateTme.strings.Wednesday	Wednesday
DateTme.strings.Thu	Thu
DateTme.strings.Thursday	Thursday
DateTme.strings.Fri	Fri
DateTme.strings.Friday	Friday
DateTme.strings.Sat	Sat
DateTme.strings.Saturday	Saturday
DateTme.strings.Sun	Sun
DateTme.strings.Sunday	Sunday
DateTme.strings.Jan	Jan
DateTme.strings.January	January
DateTme.strings.Feb	Feb
DateTme.strings.February	February
DateTme.strings.Mar	Mar
DateTme.strings.March	March
DateTme.strings.Apr	Apr
DateTme.strings.April	April
DateTme.strings.May	May
DateTme.strings.MayFull	May
DateTme.strings.Jun	Jun
DateTme.strings.June	June
DateTme.strings.Jul	Jul
DateTme.strings.July	July
DateTme.strings.Aug	Aug
DateTme.strings.August	August
DateTme.strings.Sep	Sep
DateTme.strings.September	September
DateTme.strings.Oct	Oct
DateTme.strings.October	October
DateTme.strings.Nov	Nov
DateTme.strings.November	November
DateTme.strings.Dec	Dec
DateTme.strings.December	December
DateTme.strings.A	A
DateTme.strings.AM	AM
DateTme.strings.P	P
DateTme.strings.PM	PM
DateTme.strings.TimeSeparator	:
DateTme.strings.DateSeparator	/

TimeSpan Class

Constructor	Description
TimeSpan(millis : int)	Creates a TimeSpan from the specified amount of milliseconds
TimeSpan(days : int, hours : int)	Creates a TimeSpan from the specified amount of days and hours
TimeSpan( hours : int, minutes : int, seconds : int)	Creates a TimeSpan from the specified amount of hours, minutes and seconds
TimeSpan(days : int, hours : int, minutes : int, seconds : int)	Creates a TimeSpan from the specified amount of days, hours, minutes and seconds
TimeSpan(days : int, hours : int, minutes : int, seconds : int, millis : int)	Creates a TimeSpan from the specified amount of days, hours, minutes, seconds and milliseconds

Method	Return Value	Description
add(t : TimeSpan)	TimeSpan	Adds the specified time to the timespan and returns the result
compareTo(t : TimeSpan)	int	-1, 0 or 1, depending on the compare result
days()	int	Returns the days in the TimeSpan
duration()	TimeSpan	Returns the absolute value of the TimeSpan
equals(t : TimeSpan)	bool	Returns a bool indicating if the specified TimeSpan has the same value
hours()	int	Returns the hours in the TimeSpan
negate()	TimeSpan	Returns the negation of the time
milliseconds()	int	Returns the milliseconds in the TimeSpan
minutes()	int	Returns the minutes in the TimeSpan
seconds()	int	Returns the seconds int the TimeSpan
totalDays()	double	Returns the total days in the TimeSpan
totalHours()	double	Returns the total hours in the TimeSpan
totalMinutes()	double	Returns the total minutes in the TimeSpan
totalMilliseconds()	int	Returns the total of milliseconds in the TimeSpan
totalSeconds()	double	Returns the total of seconds in the TimeSpan
subtract(t : TimeSpan)	TimeSpan	Subtracts the specified TimeSpan to the value and returns the result