如何将Python datetime.datetime 转换为 excel 序列日期号

本文将讨论Python datetime.datetime 到excel 序列日期数的转换。 Excel“序列日期”格式实际上是自 1900-01-00 以来的天数。这 strftime()函数用于将日期和时间对象转换为其字符串表示形式。它接受一个或多个格式化代码的输入并返回字符串表示。

Syntax:

strftime(format)

Parameters: This function accepts a parameter which is illustrated below:

• format: This is the specified format code in which the given date and time object is going to be represented.

Return values: It returns the string representation of the date or time object.

例1：在下面的例子中，当前日期和时间被转换成excel序列日期号。并且返回的输出将采用'08/23/21 15:15:53'的格式，它被Excel接受为有效的日期/时间并允许在Excel中进行排序。

Python3

# Python3 code to illustrate the conversion of
# datetime.datetime to excel serial date number
 
# Importing datetime module
import datetime
 
# Calling the now() function to return
# current date and time
current_datetime = datetime.datetime.now()
 
# Calling the strftime() function to convert
# the above current datetime into excel serial date number
print(current_datetime.strftime('%x %X'))

输出：

08/23/21 15:15:53

如果我们需要日期值形式的 excel 序列日期编号，那么可以使用toordinal()函数来完成。

示例 2：日期值形式的序列号

蟒蛇3

# Python3 code to illustrate the conversion of
# datetime.datetime to excel serial date number
 
# Importing date module from datetime
from datetime import date
 
# Taking the parameter from the calling function
def convert_date_to_excel_ordinal(day, month, year):
 
    # Specifying offset value i.e.,
    # the date value for the date of 1900-01-00
    offset = 693594
    current = date(year, month, day)
 
    # Calling the toordinal() function to get
    # the excel serial date number in the form
    # of date values
    n = current.toordinal()
    return (n - offset)
 
# Calculating the excel serial date number
# for the date "02-02-2021" by calling the
# user defined function convert_date_to_excel_ordinal()
print(convert_date_to_excel_ordinal(2, 2, 2021))

输出：

44229

示例：在下面的示例中，参考 1899-12-30 日期将“2021-05-04”日期转换为 excel 序列日期编号。

蟒蛇3

# Python3 code to illustrate the conversion of
# datetime.datetime to excel serial date number
 
# Importing datetime module
from datetime import datetime
import datetime as dt
 
 
def excel_date(date1):
 
    # Initializing a reference date
    # Note that here date is not 31st Dec but 30th!
    temp = dt.datetime(1899, 12, 30)
    delta = date1 - temp
    return float(delta.days) + (float(delta.seconds) / 86400)
 
 
# Calculating the excel serial date number
# for the date "2021-05-04" by calling the
# user defined function excel_date()
print(excel_date(datetime(2021, 2, 4)))

输出：

44231.0