Mathematical operations with 'timeDate' objects

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)

Arguments

e1, e2: usually objects of class "timeDate", in the case of addition and subtraction e2 may be of class numeric.

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.

Examples

## Create Character Vectors:
   dts = c("1989-09-28", "2001-01-15", "2004-08-30", "1990-02-09")
   dts
#> [1] "1989-09-28" "2001-01-15" "2004-08-30" "1990-02-09"
   tms = c(  "23:12:55",   "10:34:02",   "08:30:00",   "11:18:23")
   tms
#> [1] "23:12:55" "10:34:02" "08:30:00" "11:18:23"
   
## "+/-" - 
   # Add One Day to a Given timeDate Object:
   GMT = timeDate(dts, zone = "GMT", FinCenter = "GMT")
   GMT
#> GMT
#> [1] [1989-09-28] [2001-01-15] [2004-08-30] [1990-02-09]
   ZUR = timeDate(dts, zone = "GMT", FinCenter = "Europe/Zurich")
   ZUR
#> Europe/Zurich
#> [1] [1989-09-28 01:00:00] [2001-01-15 01:00:00] [2004-08-30 02:00:00]
#> [4] [1990-02-09 01:00:00]
   GMT + 24*3600
#> GMT
#> [1] [1989-09-29] [2001-01-16] [2004-08-31] [1990-02-10]
   ZUR[2] - ZUR[1] 
#> Time difference of 4127 days