[Tutor] Converting "HH:MM:SS" to datetime

[Marc Tompkins]

On Sun, Mar 1, 2009 at 10:04 AM, Wayne Watson
<sierra_mtnview at sbcglobal.net>wrote:

>  Ok, how do I do what's mentioned in Subject?
>


One thing to be aware of - Python datetimes are just that: date + time.  If
you specify only the time, the date will be filled in with a default value -
generally the beginning of the epoch for your particular platform.

"datetime" objects (but not "time" objects!) have a method called "strptime"
which does exactly what you want - you give it an input string and a format
string to tell it how to interpret the input, and it returns a datetime
object.  Then you can remove the date portion and you're done:
>>> import datetime
>>> blah = datetime.datetime.strptime("13:01:15","%H:%M:%S")
>>> blah
datetime.datetime(1900, 1, 1, 13, 1, 15)
>>> blah = blah.time()
>>> blah
datetime.time(13, 1, 15)

The format string for strptime uses the same conventions as the strftime()
function; they're generally not listed separately.

Or you can hack the string into its component parts and create the time from
a timetuple:
(I'm including the mistakes I made along the way)
>>> inDateStr = "13:01:15"
>>> inHour = inDateStr[:2]
>>> inHour
'13'
>>> inMin = inDateStr[4:6]
>>> inMin
'1:'
>>> inMin = inDateStr[3:5]
>>> inMin
'01'
>>> inSec = inDateStr[-2:]
>>> inSec
'15'
>>> blah = datetime.time(inHour, inMin, inSec)
Traceback (most recent call last):
  File "<input>", line 1, in <module>
TypeError: an integer is required
>>> blah = datetime.time(int(inHour), int(inMin), int(inSec))
>>> blah
datetime.time(13, 1, 15)
>>>


Hope that helps.


-- 
www.fsrtechnologies.com
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