Filling an excel file with python is messing up my dates

Here is the process,
I have an xlsm file called template, inside a worksheet called data.
Then I have 5 Csv files, I must put the content of all csv file inside the data worksheet.

No problems to do that, except if a date is “07/09/12” it will become “09/07/12” in excel.

So I have a list called data, here is a print of one of it’s line

['07/09/12', 'LARO', 'MEDITERRAN', '245', 'UZES', '11', '0', '0', '0', '0', '11', '0']

I’m putting the in the excel file with this piece of code :

First I open the file (xl is because I use “with self as xl”)

def open(self):
    self.xl.Visible = 1
    self.xl.ScreenUpdating = False
    self.worksheet = self.xl.Workbooks.Open(self.getOutputFile())

Then I erase the data worksheet

def cleanData(self):
    sheet = self.xl.Sheets(self.sheetName)
    def findNumberOfLines(start_line):
        nb = 0
        while sheet.Cells(start_line + nb, self.startColumn).Value is not None:
            nb += 1
        return nb

Then I fill the data

def fillData(self):
    sheet = self.xl.Sheets(self.sheetName)
    noRow = self.startLine
    for row in self.data:
        noCol = self.startColumn
        for i, value in enumerate(row):
            sheet.Cells(noRow, noCol).Value = value
            noCol+=1
        noRow+=1

And I save

def save(self):
    self.worksheet.Save()

And everythong is good except the day and month are inverted inside excel (it’s not displaying US format, it’s displaying EUR format with month and day inverted (3 october becomes 9 march, tested using “long date” format)

Weird thing : the excel cell containing dates is set at “standard” but once it has been filed by my python script it’s set at “date”

WORKAROUND
when filling the sheet I’m intercepting every date and converting them
to datetime, excel seems to like that

def fillData(self):
    sheet = self.xl.Sheets(self.sheetName)
    noRow = self.startLine
    pattern = re.compile('^\d+/\d+/\d+$')
    for row in self.data:
        noCol = self.startColumn
        for i, value in enumerate(row):

            if (pattern.match(str(value))):
                date = value.rsplit('/')
                sheet.Cells(noRow, noCol).Value = datetime(int(date[2]), int(date[1]), int(date[0]))
            else: sheet.Cells(noRow, noCol).Value = value
            noCol+=1
        noRow+=1

Tags: date, excel, file, pythonpython