ExcelWriter ValueError: Excel does not support datetime with timezone when saving df to Excel

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.

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')