How to convert the date and time from IST to EST?

[sivastat08]

Hi ,I want to convert Date_time character variable(IST) to EST (date and time format) .please help me.

original_date	time_ist	Date_time
28/12/2016	3:06:36	28DEC2016/3:06:36
11/11/2016	19:56:35	11NOV2016/19:56:35
11/11/2016	19:55:58	11NOV2016/19:55:58
11/11/2016	19:53:25	11NOV2016/19:53:25
11/11/2016	19:55:26	11NOV2016/19:55:26
11/11/2016	19:51:53	11NOV2016/19:51:53
11/11/2016	19:52:25	11NOV2016/19:52:25
16/11/2016	14:00:56	16NOV2016/14:00:56
16/11/2016	13:25:02	16NOV2016/13:25:02
16/11/2016	15:23:54	16NOV2016/15:23:54
16/11/2016	14:00:18	16NOV2016/14:00:18
16/11/2016	13:08:55	16NOV2016/13:08:55
16/11/2016	16:21:36	16NOV2016/16:21:36

Thanks,

Siva

[Kurt_Bremser]

Do

data want;
set have;
original_date = datepart(input(date_time,datetime20.));
time_ist = timepart(input(date_time,datetime20.));
format
  original_date ddmmyy10.
  time_ist time8.
;
run;

[sivastat08]

Thanks sir.

[sivastat08]

Hi KurtBremser, I want both variable (original_date) and (time_ist) should be concatenated in new column (Date_time) and also convert into EST format

[Kurt_Bremser]

Consulting wikipedia, the only date/time-related uses of the acronym EST are Eastern Standard Time and European Summer Time. Do you want to factor in a timezone?

Otherwise describe how the final variable should be formatted. When dealing with such values, it's usually best to keep the value as a true SAS datetime value (seconds from 1960-01-01T00:00:00) and use an appropriate format (you can even create a custom one yourself).

[sivastat08]

original_date	time_ist
28/12/2016	3:06:36

Here original date is 28/12/2016 and ist time is 3:06:36 which is Indian Standard Time (IST), I want to convert it to 27/12/2016 and 17:06:36 Estern Standard Time (EST (USA/Canada)).

[Kurt_Bremser · Accepted solution]

Well, IST is UTC+5:30, while ET (or EST) is UTC-5, so we have to subtract 10:30 from IST time to get the correct timestamp for ET:

data want;
input date_time :$20.;
dt_time = input(date_time,datetime20.);
format dt_time e8601dt20.;
dt_time = dt_time - '10:30:00't;
cards;
28DEC2016/3:06:36
11NOV2016/19:56:35
11NOV2016/19:55:58
11NOV2016/19:53:25
11NOV2016/19:55:26
11NOV2016/19:51:53
11NOV2016/19:52:25
16NOV2016/14:00:56
16NOV2016/13:25:02
16NOV2016/15:23:54
16NOV2016/14:00:18
16NOV2016/13:08:55
16NOV2016/16:21:36
;
run;

You now have a datetime value for Eastern Time, and can use datepart() and timepart() to extract the ET date and time values from that.

[sivastat08]

Thank you very much for your time