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doc: dates subtraction has two functionalities

time-shift
Houtan Bastani 2014-01-13 16:19:24 -05:00
parent 886514894b
commit 54a0039c64
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@ -8568,7 +8568,11 @@ Increments a date by one period. @code{+1950Q1} is identical to @code{1950Q2}, @
@item minus binary operator (@code{-})
The difference between two dates is a number of periods. For instance if @code{1951Q2-1950Q1} is equal to @code{5} (quarters).
Has two functions: difference and subtraction. If the second argument
is a date, calculates the difference between the first date and the
second date (@i{e.g.} @code{1951Q2-1950Q1} is equal to @code{5}). If
the second argument is an integer @code{X}, subtracts @code{X} periods
from the date (@i{e.g.} @code{1951Q2-2} is equal to @code{1950Q4}).
@item minus unary operator (@code{-})