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Language of aqConvert.DateTimeToFormatStr

Occasional Contributor

Language of aqConvert.DateTimeToFormatStr


I have an application that i have to test in English and in French, at different URL-s.
One of the things i have to test is, at the last page, a string which, with words, tells me the date of an appointment, and it is of the form

Friday, December 13, 2019 ─ 08:00 pm

I have the date the form of numbers, i.e. 13 for the day, 12 for the month, and so on.
So i put these numbers in a datetime structure and use aqConvert.DateTimeToFormatStr to convert the datetime to a string with the appropriate format modifiers, and compare the obtained string with the string really displayed on the web page.
When my page is in English, everything is fine!

However, the problem arises when the application is in French. In this case, since my computer has an English language OS, so DateTimeToFormatStr converts the date to a string in an english language, as above. But my application is in French, so it displays the string as:

Vendredi 13 décembre 2019 ─ 20:00 pm

So my question is, is there any way to tell DateTimeToFormatStr to use another locale, not the default one in English?

Or alternatively, is there any way to change via the script the regional settings of my computer temporarily to French, to make the comparison, and to switch them back to English? Of course without stopping the script?

The idea is to compare the result of DateTimeToFormatStr with the string displayed by my application, regardless of the app language.

All suggestions are appreciated!

Esteemed Contributor

I've used your same code effectively and SetLocaleInfo is returning true. However, I'm not able to see the effect in my overall system. So, not sure what EXACTLY changed. I've used aqEnvironment to set the local date and time on a machine but I've not had to change languages or such. So, for myself, I think I'm not going to be much help as I'd be learning along with you. Hopefully someone else with more experience with SetLocaleInfo can help further.

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Occasional Contributor

OK, no problem, thank you for your help, it is much appreciated!

I will try later to create the string myself, without even using the aqConvert.DateTimeToFormatStr() method.

From the numbers, i will generate directly the string by myself in the correct language. 


Thank you,


SmartBear Alumni (Retired)

Hi @krosav,

Do you mind sharing the progress on this issue? Did you find the solution?

Tanya Yatskovskaya
SmartBear Community and Education Manager

SmartBear Alumni (Retired)

Hi @krosav,


In case you still need some help, I've found the Setting the System Language From Scripts article in the TestComplete documentation. It says that rebooting is required after changing the system language. I think this is the key. Try applying the suggestion from this article and let us know how it works for you.

Tanya Yatskovskaya
SmartBear Community and Education Manager

@krosav :
Hi Kroum,


Another idea that might help is to use dotNET object in TestComplete and something like the code suggested, for example, here:

or, maybe,




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