Hello Golang-nuts,
*package main*
*import (*
* "fmt"*
* "time"*
*)*
*func main() {*
* t := time.Date(2009, time.December, 31, 23, 0, 0, 0, time.UTC)*
* fmt.Println(t)*
* fmt.Println(t.AddDate(0, -1, 0))*
*}*
https://play.golang.org/p/hZ7nhnkepK
The result is
2009-12-31 23:00:00 +0000 UTC
2009-12-01 23:00:00 +0000 UTC
I think it should be:
2009-12-31 23:00:00 +0000 UTC
2009-11-30 23:00:00 +0000 UTC
Documentation states that "AddDate normalizes its result in the same way that
Date does, so, for example, adding one month to October 31 yields December 1,
the normalized form for November 31." This is makes sense when you work with
time.Date() function, because hours and minutes involved, time zones, daylight
savings etc.
But it doesn't make any sense If you operate with days, months, years for
analytical purposes. I think the normal practice ("Normalization") in this case
would be to add exactly one month just like in other languages. Not one month
and one day. SQL for example:
DECLARE @sp_Date DATETIME = '2009-12-31'
SELECT @sp_Date
SELECT DATEADD(mm , -1, @sp_Date)
2009-12-31 00:00:00.000
2009-11-30 00:00:00.000
--
You received this message because you are subscribed to the Google Groups
"golang-nuts" group.
To unsubscribe from this group and stop receiving emails from it, send an email
to golang-nuts+unsubscr...@googlegroups.com.
For more options, visit https://groups.google.com/d/optout.
