ExcelWriter ValueError: Excel 将 df 保存到 Excel 时不支持带时区的日期时间

Question

I'm running on this issue for quite a while now.

I set the writer as follows:

writer = pd.ExcelWriter(arquivo+'.xlsx', engine = 'xlsxwriter', options = {'remove_timezone': True})
df.to_excel(writer, header = True, index = True)

This code is inside s function. The problem is every time I run the code, it gets information from the database, which contains two columns datetime64[ns, UTC] object with time zone info. But when the code to save to Excel runs I receive:

ValueError: Excel does not support datetimes with timezones. Please ensure that datetimes are timezone unaware before writing to Excel.

I have already tried several things like 'dt.tz_convert', replace(tzinfo=None) and other solutions I have found here and around.

The code runs without problem in my personal computer, my colleague at work with the same machine specs can run the code. Only in my machine it doesn't. I already reinstalled python and all the packages, including formatting the machine and nothing, the error persists.

xlrd v1.1.0

xlsxwriter v1.0.4

python 3.7.4

pandas v0.25.1

If someone could bring some light into this issue I would much appreciate it.

Thanks

Answer 1

What format is your timestamps in?

I just had a similar problem.

I was trying to save a data frame to Excel. However I was getting:

I checked my date format which was in this format '2019-09-01T00:00:00.000Z'

This is a timestamp pandas._libs.tslibs.timestamps.Timestamp from pandas.to_datetime

which includes a method date() that converted the date into a format "%Y-%m-%d" that was acceptable by excel

So my code was something like:

#Pseudo
df['date'] = old_dates
df['date'] = df['date'].apply(lambda a: pd.to_datetime(a).date()) 
# .date() removes timezone

...df.to_excel etc.

Answer 2

This should do the job, remove timezone from columns before exporting to excel (using tz_localize(None)).

# Check which columns have timezones datetime64[ns, UTC] 
df.dtypes

# Remove timezone from columns
df['date'] = df['date'].dt.tz_localize(None)

# Export to excel
df.to_excel('filename.xlsx')

Answer 3

I found this way easier and more dynamic. This solution you select the columns by the type and applied the desire conversion.

date_columns = df.select_dtypes(include=['datetime64[ns, UTC]']).columns
for date_column in date_columns:
    df[date_column] = df[date_column].dt.date
    
df.to_excel('anbima_feed.xlsx',engine='xlsxwriter')

Answer 4

The Accepted Answer works only if you need the Date without the Time in the corresponding Timezone. If your Time is in UTC as a Epoch you need to convert it to Striftime and then again to Datetime to conserve the Time in the Timezone.

Reference: https://python-forum.io/thread-31300.html

Example: the field ts is a timestamp in UTC as Epoch in millisecond.

df['ts']
OUT:
0      1619801902867
1      1619765681594
2      1619712291984
3      1619680298648
4      1619629032109
5      1619593388626
6      1619531314509
7      1619509338368
8      1619449287828
9      1619433411243
10     1619103667781
11     1619078244871
12     1619021782951
13     1618990214111
14     1618931135540
15     1618903774632

Then you need to convert it into the desired Timezone:

df['ts'] = pd.to_datetime(df['ts'],unit='ms').dt.tz_localize('utc').dt.tz_convert('Europe/Vatican')
df['ts'] = df['ts'].apply(lambda a: datetime.datetime.strftime(a,"%Y-%m-%d %H:%M:%S"))
df['ts'] = pd.to_datetime(df['ts'])

The Result will look like:

df['ts']
OUT:
0     2021-04-30 18:58:22
1     2021-04-30 08:54:41
2     2021-04-29 18:04:51
3     2021-04-29 09:11:38
4     2021-04-28 18:57:12
5     2021-04-28 09:03:08
6     2021-04-27 15:48:34
7     2021-04-27 09:42:18
8     2021-04-26 17:01:27
9     2021-04-26 12:36:51
10    2021-04-22 17:01:07
11    2021-04-22 09:57:24
12    2021-04-21 18:16:22
13    2021-04-21 09:30:14
14    2021-04-20 17:05:35
15    2021-04-20 09:29:34

After this, the xlsxwriter will accept it and write the excel without the error Message.

Answer 5

There is also another way to use UTC parameter in Pandas

import pandas as pd
# Adjust time zone from columns
df['date'] = pd.to_datetime( df['date'], errors='coerce',utc=True)
# Export to excel
df.to_excel('filename.xlsx')

Answer 6

I encountered the same issue and did some documentation search and found a solution for pandas

The below change (added- options={'remove_timezone': True} ) worked for me.

exwriter = pd.ExcelWriter(fullpath, engine='xlsxwriter', options={'remove_timezone': True})

Answer 7

If you are oke with the values in the sheet being a string, you can use the following code to transform the datetime

date_columns = df.select_dtypes(include=['datetime64[ns, UTC]']).columns
for date_column in date_columns:
    df[date_column] = df[date_column].apply(str)

Answer 8

I had a similar problem. In my case the dates were the index. In case anyone else encounters that very problem (oftentimes with stock/currency/crypto price data) you can use the following:

df.index = df.index.tz_localize(None)
df.to_excel(path)

Answer 9

Simply, convert the column to str :

df['date'] = df['date'].astype(str)