timeDate (version 3043.102)

timeDateMathOps: timeDate Mathematical Operations

Description

Functions for mathematical and logical operations on 'timeDate' objects.

The functions are:

Ops,timeDate	Group 'Ops' generic functions for 'timeDate' objects,
+,timeDate	Performs arithmetic + operation on 'timeDate' objects,
-,timeDate	Performs arithmetic - operation on 'timeDate' objects.

Usage

# S4 method for timeDate,timeDate
Ops(e1, e2)

Value

Ops.timeDate

these are functions for mathematical operations. Group Ops are generic functions which manage mathematical operations.

+.timeDate

-.timeDate

The plus operator "+" performs arithmetic "+" operation on

timeDate objects, and the minus operator "-" returns a

difftime object if both arguments e1 and e2

are "timeDate" objects, or returns a "timeDate" object

e2 seconds earlier than e1.

Arguments

e1, e2

usually objects of class timeDate, in the case of addition and subtraction e2 may be of class numeric.

Examples

## Create Character Vectors:
   dts = c("1989-09-28", "2001-01-15", "2004-08-30", "1990-02-09")
   dts
   tms = c(  "23:12:55",   "10:34:02",   "08:30:00",   "11:18:23")
   tms
   
## "+/-" - 
   # Add One Day to a Given timeDate Object:
   GMT = timeDate(dts, zone = "GMT", FinCenter = "GMT")
   GMT
   ZUR = timeDate(dts, zone = "GMT", FinCenter = "Europe/Zurich")
   ZUR
   GMT + 24*3600
   ZUR[2] - ZUR[1]