system.date.add*
This function is a set of functions to add and subtract time that include:
| Function | Description | 
| system.date.addMillis | Add or subtract an amount of milliseconds to a given date and time. | 
| system.date.addSeconds | Add or subtract an amount of seconds to a given date and time. | 
| system.date.addMinutes | Add or subtract an amount of minutes to a given date and time. | 
| system.date.addHours | Add or subtract an amount of hours to a given date and time. | 
| system.date.addDays | Add or subtract an amount of days to a given date and time. | 
| system.date.addWeeks | Add or subtract an amount of weeks to a given date and time. | 
| system.date.addMonths | Add or subtract an amount of months to a given date and time. This function is unique since each month can have a variable number of days. For example, if the date passed in is March 31st, and we add one month, April does not have a 31st day, so the returned date will be the proper number of months rounded down to the closest available day, in this case April 30th. | 
| system.date.addYears | Add or subtract an amount of years to a given date and time. | 
system.date. add*( date, value )
-     Parameters 
Date date- The starting date.
Int value - The number of units to add, or subtract if the value is negative.
-     Returns 
Date - A new date object offset by the integer passed to the function.
-     Scope 
All
#This example would add two days to the date passed in. today = system.date.now()twoDaysFromToday = system.date.addDays(today, 2)#This example would subtract twenty minutes from a date object we create.#Even though our original date starts on the 28th, it starts at midnight,#so subtracting 20 minutes puts it at the previous day. date = system.date.getDate(2018, 4, 28) #This would print out like Mon May 28 00:00:00 PDT 2018print system.date.addMinutes(date, -20) #This will print Sun May 27 23:40:00 PDT 2018#This example can be placed on the property change script of one calendar component.#It will then automatically set a second calendar component two weeks in advanced of the first calendars selected date.if event.propertyName == "date":	date = event.newValue	event.source.parent.getComponent('End Date Calendar').date = system.date.addWeeks(date, 2)