# aqConvert.DateTimeToFormatStr(aqDateTime.Today(),"%U") format is not work properly

Hi All

aqConvert.DateTimeToFormatStr(aqDateTime.Today(),"%U") is return wrong week number.

Ex i have evaluate the function format on date 02.05.2018, So current week number is 18

but this function format return 17 which is wrong.

This function format is not working properly please refer attached image.

nice, will_fetherolf! Then it's not a bug, just a misunderstanding of what's being returned.

so, %U will still work, you just need to make sure that you add 1 to any result to get the ISO standard week number.

However, it looks like %W is still what you're looking for. Just did a quick check and %W does it's numbering starting with 1 while %U numbers starting with 0. That's a documentation problem since %W also seems to note that the week numbering starts with 0.

In short... use %W to get the ISO standardized week number with weeks starting on Monday and numbering starting with 1.