number - number → number
time - number → time
time - time → number
number.sub(number[, number, ...]) → number
time.sub(number[, number, ...]) → time
time.sub(time) → number
Subtract two numbers.
Example: It’s as easy as 2 - 2 = 0.
(r.expr(2) - 2).run(conn)
Example: Create a date one year ago today.
r.now() - 365*24*60*60
Example: Retrieve how many seconds elapsed between today and date.
r.now() - date
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