Can I get a datetime output in a different Time Zone from the input Time Zone in one function call?

6 次查看（过去 30 天）
Jeff Waldron
Jeff Waldron 2017-1-20
评论： Walter Roberson 2017-1-23
d = datetime('2016-Jan-20 12:00:00','TimeZone','UTC')
and then
d.TimeZone = 'America/New_York'
gets me the transformed time from the input... is there any way to get this answer in the original function call, without haveing the 2nd command? I know there is a Format option, but I cannot see how one can add a TimeZone in that. transform the input TimeZone.

请先登录，再回答此问题。

采纳的回答

Walter Roberson
Walter Roberson 2017-1-23
d = subsasgn(datetime('2016-Jan-20 12:00:00','TimeZone','UTC'), struct('type', '.', 'subs', {'TimeZone'}), 'America/New_York');
You might want to create a help function for that, like
sset = @(var, sub, val) subsassgn(var, struct('type', '.', 'subs', {sub}), val);
and then
sset(datetime('2016-Jan-20 12:00:00','TimeZone','UTC'), 'TimeZone', 'America/New_York')
or
datetimeNY = @(date) subsasgn( datetime(date, 'TimeZone', 'UTC'), struct('type', '.', 'subs', {'TimeZone'}), 'America/New_York');
which you could then use as
d = datetimeNY('2016-Jan-20 12:00:00');
  1 个评论
Jeff Waldron
Jeff Waldron 2017-1-23
Walter,
Thank you... that's great... I have seen subsasgn in a couple other answers on other topics, but I've never used it, and thus always forget about it's capabilitities... Appreciate the direction.

请先登录，再进行评论。

更多回答（2 个）

Peter Perkins
Peter Perkins 2017-1-23
I think this also does what you want:
>> d = datetime('2016-Jan-20 12:00:00 UTC','InputFormat','yyyy-MMM-dd HH:mm:ss z','TimeZone','America/New_York')
d =
datetime
20-Jan-2016 07:00:00
but it requires that 'UTC' be appended to each timestamp. So choose your poison: is calling subsasgn directly better or worse? The only reason I can think to need one line is that you're writing an anonymous function.
Maitreyee Mordekar
Maitreyee Mordekar 2017-1-23
Hi Jeff,
The following command will help you set the desired functionality-
d = datetime('2016-Jan-20 12:00:00','TimeZone','America/New_York');
The following link is the reference documentation for 'datatime' function-
https://in.mathworks.com/help/matlab/ref/datetime.html
  2 个评论
Walter Roberson
Walter Roberson 2017-1-23
That does not quite do what Jeff needs. Jeff needs to create a time in UTC and then shift it to New York timezone. The time that would be created by the command you show would differ by 5 hours from the time created by the commands that Jeff shows.
Peter Perkins
Peter Perkins 2017-1-23
Just to expand a bit on this:
If you assign the TimeZone property of an unzoned datetime, the result will "look" the same, in other words, it becomes the same clockface time in a specific time zone.
On the other hand, if you assign the TimeZone property of a datetime that's already in a specific time zone, the instant in time remains the same, but it "looks" different because of the different time zone offsets. So what Walter is saying is that creating a datetime at 12pm in UTC, and then setting its TimeZone property to America/New_York results in 7am, New York time. Same instant, different timestamp.

请先登录，再进行评论。

类别

在 Help Center 和 File Exchange 中查找有关 Dates and Time 的更多信息

标签

产品

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by