MATLAB: How to convert UTC timehour into IST time hour

convertion of utc to istutc

I have UTC time in 24 hourly time and i need to convert it into IST. For example i have UTC time as 18.607 and i need to convert it into IST time format.

Best Answer

Since IST is simply UTC +5:30, in the absence of date, it's simply:

ISTtime = mod(UTCtime + 5.5, 24)

Related Solutions

MATLAB: Hi, i have two dates like 2013_12_28 and 2014_01_06, and i want to calculate the mean date (2014_01_01) which would be in the form of 2014.0014

md = mean(datenum({'2013_12_28', '2014_01_06'}, 'YYYY_mm_dd'));
dv = datevec(md);
days_into_year = md - datenum([dv(1),1,1]);

But once you have days_into_year you have to convert that into a year fraction, which requires careful definition of how long a "year" is. Is a "year" 365 days, always? Is a "year" 365.2421875 days? Is a "year" 365 days for non-leap years but 366 days for leap-years? If so then should it be 365 days for dates in the year before the leap day but 366 for dates on or after the leap day?

Converting to a specific date is much easier, and getting the result in terms of days is easy, but fraction of a year needs clarification.

MATLAB: How to assign UTC time

It's a clash of conventions. Isn't it always? Some conventions define east as positive, some as negative. For the timezones function, "the list includes the offset from UTC (in hours, where east is positive)", so to get your timestamp, you take a UTC timestamp and add your offset (see my earlier comment). For reasons I've forgotten, the IANA time zone database uses the convention that west is positive: "In the "Etc" area, zones west of GMT have a positive sign and those east have a negative sign in their name (e.g "Etc/GMT-14" is 14 hours ahead/east of GMT.)"

And elsewhere on that page: "Sign is intentionally inverted." It's confusing. If it helps, you can do either of these as described in the datetime doc):

>> d.TimeZone = '+01:00'
d = 
  datetime
   16-Mar-2017 23:06:01
>> d.TimeZone
ans =
    '+01:00'
>> d.TimeZone = 'UTC+1'
d = 
  datetime
   16-Mar-2017 23:06:01

Using a non-DST time zone is a bit unusual, and in some situations will garner you a warning that more or less says, "that time zone doesn't use DST, do you really want that?" I think that by, "The data set does not have DST", you mean that your timestamps are recorded in the local time 1 hour east (if I was a betting man) of UTC without DST adjustments, so I think yes, you really do want that.

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Related Solutions

MATLAB: Hi, i have two dates like 2013_12_28 and 2014_01_06, and i want to calculate the mean date (2014_01_01) which would be in the form of 2014.0014

MATLAB: How to assign UTC time

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