Re: how to calc the difference between two datetimes?

[Stewart Midwinter]

thanks Robert, those 4 lines of code sure beat the 58 of my
home-rolled time-date function!

cheers
S
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Re: how to calc the difference between two datetimes?

[Jp Calderone]

On Sun, 8 May 2005 19:06:31 -0600, Stewart Midwinter <[EMAIL PROTECTED]> wrote:
>After an hour of research, I'm more confused than ever. I don't know
>if I should use the time module, or the eGenix datetime module. Here's
>what I want to do:  I want to calculate the time difference (in
>seconds would be okay, or minutes), between two date-time strings.
>
>so: something like this:
>time0 = "2005-05-06 23:03:44"
>time1 = "2005-05-07 03:03:44"
>
>timedelta = someFunction(time0,time1)
>print 'time difference is %s seconds' % timedelta.
>
>Which function should I use?

  The builtin datetime module:

>>> import datetime
>>> x = datetime.datetime(2005, 5, 6, 23, 3, 44)
>>> y = datetime.datetime(2005, 5, 8, 3, 3, 44)
>>> x - y
datetime.timedelta(-2, 72000)
>>> y - x
datetime.timedelta(1, 14400)
>>> 

  Parsing the time string is left as an exercise for the reader (hint: see the 
time module's strptime function).

  Jp
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RE: how to calc the difference between two datetimes?

[Robert Brewer]

Stewart Midwinter wrote:
> After an hour of research, I'm more confused than ever. I don't know
> if I should use the time module, or the eGenix datetime module. Here's
> what I want to do:  I want to calculate the time difference (in
> seconds would be okay, or minutes), between two date-time strings.
> 
> so: something like this:
> time0 = "2005-05-06 23:03:44"
> time1 = "2005-05-07 03:03:44"
> 
> timedelta = someFunction(time0,time1)
> print 'time difference is %s seconds' % timedelta.
> 
> Which function should I use?

Use datetime.datetime objects and subtract one from the other:
http://docs.python.org/lib/datetime-datetime.html

import datetime
time0 = datetime.datetime(2005, 5, 6, 23, 3, 44)
time1 = datetime.datetime(2005, 5, 7, 3, 3, 44)

td = time1 - time0
print 'time difference is %s seconds' % td


The "td" object will be a datetime.timedelta object.


Robert Brewer
MIS
Amor Ministries
[EMAIL PROTECTED]
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