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
date.toordinal(date(1970, 1, 1)) gives a result of 719163, which does not match the result in the question
719529 with input 1970, 1, 1 using your command.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)
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.
date(...) - date(...) → timedelta, and timedelta has a days attribute.
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. :)