Some time ago a Google employee wrote a blog about this. Essentially the 
data is complete at 04.00h in the time zone of that account. But beware of 
a few notable exceptions:
- When the account advertises on display networks or at search partners, it 
may be victim of click fraud. Google detects this and reverses the damages, 
but that takes two to three days. So the clicks and cost may change in the 
next days.
- Conversions are attributed to the date of the last click, even when there 
are days between the conversion date and click date. The maximum time span 
is the life time of the conversion, which is thirty days. Further, 
conversion results are synchronized within the Google networks with low 
priority, so add another day as well.
 
To make calculations on time zone differences, and dealing with related 
issues like (differences in start days of) daylight savings time, look 
at the libraries of your framework and/or programming language.
 
 
 

On Sunday, July 22, 2012 10:28:50 AM UTC+2, nf7588 wrote:

> Hi Oliver,
>
> Sorry for the delay in my response. we have scheduled a service to 
> retrieve the reports once a day on  YESTERDAY  value.
> but i was wondering how do i make the calculation? if i'm in Time Zone GMT 
> and want to download report for a client in GMT -8
> how can i be sure when the API report should be retrieve for yesterday 
> date?
>
> Thank You
>
>
> On Tuesday, July 10, 2012 6:09:16 PM UTC+3, Oliver wrote:
>
>> The timezone is managed by the account itself and not by where your 
>> application is running. Every adwords account has a timezone associated 
>> with it.
>>
>> So, for example, if you use the enum value YESTERDAY as defined here:
>>
>>
>> https://developers.google.com/adwords/api/docs/reference/v201109_1/ReportDefinitionService.ReportDefinition.DateRangeType
>> then the API will return yesterday's data according to the timezone of 
>> the account irrespective of the timestamp on your hosting server.
>>
>> HTH
>>
>> Oliver
>>
>>
>> On Tuesday, July 10, 2012 3:31:33 PM UTC+1, nf7588 wrote:
>>>
>>> Hi,
>>>
>>> we have a web-based program to show the client his API reports 
>>> from Ad-words
>>> i would like to know , according to the client GMT how can i know for 
>>> sure when his data for yesterday is most updated?
>>>
>>> thank you
>>>
>>

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