shifting time in timetable

i want to shift this timetable for 1 day it means i want this, start from 03-jan-2018 regardless of hours

Answer 1

[dpb]

Not sure what the "want" really means--the present time just a day later for each observation or what, precisely?

On the presumption that's the correct guess, then

TT.Time=TT.Time+1;

[Peter Perkins]

This works, but for two reasons I would recommend adding caldays(1) rather than just 1.

1) For backwards compatibility reasons, 1 is interpreted as a datenum, i.e. days(1). But that's perhaps not obvious to someone reading the code at some later time.

2) Getting in the habit of using caldays for calendar arithmetic is a good idea, because someday, you're going to be working with zoned datetimes, and adding a day to a Sat that happens to be the day before a DST shift. days(1) means "exactly 24 hours", which probably isn't what you'd want, while caldays(1) means "one calendar day", which probably is.

>> dt = datetime(2018,11,3,14,0,0,'TimeZone','America/New_York')
dt = 
  datetime
   03-Nov-2018 14:00:00
>> dt + days(1)
ans = 
  datetime
   04-Nov-2018 13:00:00
>> dt + caldays(1)
ans = 
  datetime
   04-Nov-2018 14:00:00

days is mostly intended as a shorthand for "24 hours" when you are working with "exact times" and durations.

[dpb]

Good points, Peter.

I didn't have a klew as to what the OP was asking so was hoping for a response as to what the desire really was so I just took the shortcut to try to begin the conversation. Hadn't realized OP even came back until saw your comment just now...

Answer 2

[jonas]

Simply shifting the time without affecting the data

TT.Time = dateshift(TT.Time,'start','day')

Changing the format (hiding the time of day)

TT.Time.Format = 'dd-MMM-yyyy'

Calculating a daily average

TT2 = retime(TT,'daily','mean')

These are the answers to three possible interpretations of your question. Perhaps you could describe your problem a bit better next time.