Equivalent function of datenum(datestring) of Matlab in Python

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In Matlab, when I run "datenum" function as the following;

datenum(1970, 1, 1);

I get the following output:

719529

I'm trying to find the equivalent function or script which is gonna give me the same output. But, unfortunately I couldn't find an enough explanation on the internet to do this.

I have looked at this tutorial: https://docs.python.org/2/library/datetime.html, but it didn't help.

Could you tell me, how can I get the same output in python?

Thanks,

I would use the datetime module and the toordinal() function

from datetime import date

print date.toordinal(date(1970,1,1))

719163

To get the date you got you would use

print date.toordinal(date(1971,1,2))

719529

or for easier conversion

print date.toordinal(date(1970,1,1))+366

719529

I believe the reason the date is off is due to the fact datenum starts its counting from january 0, 0000 which this doesn't recognize as a valid date. You will have to counteract the change in the starting date by adding one to the year and day. The month doesn't matter because the first month in datetime is equal to 0 in datenum

Convert Matlab datenum into Python datetime � GitHub, def datenum_to_datetime(datenum): """ Convert Matlab datenum into Python datetime. :param datenum: Date in datenum format :return:� DateString = datestr(t) converts the datetime values in the input array t to text representing dates and times. The datestr function returns a character array with m rows, where m is the total number of datetime values in t. By default, datestr returns text in the format, day-month-year hour:minute:second.

You can substract date objects in Python:

>>> date(2015, 10, 7) - date(1, 1, 1)
datetime.timedelta(735877)

>>> (date(2015, 10, 7) - date(1, 1, 1)).days
735877

Just take care to use an epoch that is useful to your needs.

Convert date and time to string format - MATLAB datestr, This MATLAB function converts the datetime or duration values in the input array t to or equal to 12, then datenum considers the text to be in 'yy/mm/dd' format. DateNumber = datenum(t) converts the datetime or duration values in the input array t to serial date numbers.. A serial date number represents the whole and fractional number of days from a fixed, preset date (January 0, 0000) in the proleptic ISO calendar.

The previous answers return an integer. MATLAB's datenum does not necessarily return an integer. The following code retuns the same answer as MATLAB's datenum:

from datetime import datetime as dt

def datenum(d):
    return 366 + d.toordinal() + (d - dt.fromordinal(d.toordinal())).total_seconds()/(24*60*60)

d = dt.strptime('2019-2-1 12:24','%Y-%m-%d %H:%M')
dn = datenum(d)

Convert date and time to serial date number, Serial Date Number — A single number equal to the number of days since Serial date numbers are useful as inputs to some MATLAB functions that do not use the datenum or datevec functions, respectively, to convert a datetime array to � With datenum, you can convert dates into serial date format, store them in a matrix variable, and then later pass the variable to a function. Alternatively, you can use datenum directly in a function input argument list. For example, consider the function bndprice that computes the price of a bond given the yield to maturity. First set up

Convert Between Datetime Arrays, Numbers, and Text, Matlab's datenum representation is the number of days since midnight on Jan 1st , 0 AD. Python's datetime.fromordinal function assumes time is� Hi, I have table with column of datenum. I need to do a join with another table which has also a column of date but in just a plain format such as '11/1/2017'. But I got this error: Left and right key variables 'Date' and 'Date' are not comparable because one is a non-cell.

The Sociograph: Converting MATLAB's datenum to Python's datetime, Hello, I have to convert a MATLAB's datenum to Python's datetime. The following code is as below: import datetime matlab_datenum� In the datetime module, there is a function “datetime.datetime.today().weekday()”. This function returns the day of the week as an integer, where Monday is 0 and Sunday is 6. Please write a Python program using a for loop to generate and print log entries for the rest of the week starting from today.

Error when converting MATLAB's datenum to Python's datetime, A tutorial on writing MatLab-like functions using the Python language datetime( 2059, 12, 12), {'days':1, 'hours':2})] x = [p.datenum(i.date()) for� Teams. Q&A for Work. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information.

Comments
  • So, will I be able to add datestring as a parameter in "toordinal()" function?
  • date.toordinal(date(1970, 1, 1)) gives a result of 719163, which does not match the result in the question
  • Please show how do you get output 719529 with input 1970, 1, 1 using your command.
  • Thanks for your answers, horns and Alex.S. Currently I don't have Matlab in my computer, that's why I'm using online matlab compiler on this link: octave-online.net And I get this result on that page.
  • Thanks for your answer @SirParselot. Your answer is true. There is a 366 difference between MATLAB and Python.
  • Hello Kay, do you know why do I get "'datetime.date' object has no attribute 'days'" error? :)
  • Probably you missed the parentheses. date(...) - date(...) → timedelta, and timedelta has a days attribute.
  • This gives almost the same answer as mine which isn't right either. Any idea as to why?
  • @SirParselot, yes, we both use 0001-01-01 as epoch, but Matlab uses 0000-00-00 which I assume is December 31th 1 BC. That's why I said "Just take care to use an epoch that is useful to your needs", because Matlab's epoch is strange. :)