Veerarajan Karu... · Jul 12 10m read

Time zone conversion utility using embedded python

Date and Time is an important factors in our life. Because all applications are engaging based on Date/Time. But our world is split into multiple time zones. if our product is launched in the world, to maintain the history of events we are definitely required to convert all times to our local time or UTC ( Coordinated Universal Time ). As I know, many known programming languages of C#, JavaScript, Java, etc., provided the library to convert the date and time. i.e with a time zone name we can be able to convert without knowing the UTC offset.


TZ database doesn't exist in InterSystems products. In past, I have written the function in C# ( C# has a library for this) and used it inside InterSystems as a wrapper class.

But now, IRIS is started to support Embedded python. So, we can use the timezone conversion from python in InterSystems easily.


Libraries required

  1. datetime  - Basic date and time type support -
  2. pytz - tz database library -


How to install

Once install the IRIS, go to the InterSystems bin folder (\Intersystems\IRIS\bin) and execute


Windows :

irispip install --target <source>\Intersystems\IRIS\mgr\python datetime

irispip install --target <source>\Intersystems\IRIS\mgr\python pytz


Linux :

pip3 install --target /InterSystems/IRIS/mgr/python datetime

pip3 install --target /InterSystems/IRIS/mgr/python pytz


How to handle library in IRIS


Class Utility.TimezoneConversion


/// Convert the date time and return as DateTime object

/// CTime - Input date and time

/// ToTimezone - Which format we need to change the date and time

ClassMethod Convert(CTime As %String, ToTimezone As %String) As %String


Set ret = $$$OK

try {

#;datetime library to calculate the date or time

Set DateTime = ##class(%SYS.Python).Import("datetime")

#;timezone library to convert the one timezone to another timezone

Set Pytz = ##class(%SYS.Python).Import("pytz")

#; timezone apply

Set DateTimeConeverted = DateTime.datetime(+$P(CTime,":",1),+$P(CTime,":",2),+$P($P(CTime,":",3)," ",1),+$P($P(CTime,":",3)," ",2),+$P(CTime,":",4),+$P(CTime,":",5)).now(Pytz.timezone(ToTimezone))

Set ret =


catch(ex) {

Set ret = ex.AsStatus()


Quit ret


/// Convert date time into one timezone format to another timezone format

/// Input Format - YYYY:MM:DD HH:MM:SS

ClassMethod DisplayConversion() As %Status


Set ToFormat = "%Y:%m:%d %H:%M:%S"

Set CTime = "2022:07:12 12:00:00"

Set ToTimezone = "America/Mexico_City"

Set ret = ..Convert(CTime,ToTimezone)

If $IsObject(ret){

Write "InputDateTime:"_CTime,!

Write "ConvertedDateTime:"_ret.strftime(ToFormat),!

Write "Timezone Name:"_ret.tzname(),!

Write "Timezone detail:"_ToTimezone,!


Write "Error:"_ret,!






List of All Python Time zones




Performance-wise compared to the wrapper, embedded python provides a faster response and easy to implement.

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Discussion (1)1
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Hi Veera,

Very nice article, embedding the python into cache itself without any classmethod fully coded as [Python]. If you are ok, I might try this code in real case scenario ;-)

Best regards