What is the standard way to add N seconds to datetime.time in Python?
Question: Given a `datetime.time` value in Python, is there a standard way to add an
integer number of seconds to it, so that `11:34:59` \+ 3 = `11:35:02`, for
example?

These obvious ideas don't work:

    
    
    >>> datetime.time(11, 34, 59) + 3
    TypeError: unsupported operand type(s) for +: 'datetime.time' and 'int'
    >>> datetime.time(11, 34, 59) + datetime.timedelta(0, 3)
    TypeError: unsupported operand type(s) for +: 'datetime.time' and 'datetime.timedelta'
    >>> datetime.time(11, 34, 59) + datetime.time(0, 0, 3)
    TypeError: unsupported operand type(s) for +: 'datetime.time' and 'datetime.time'
    

In the end I have written functions like this:

    
    
    def add_secs_to_time(timeval, secs_to_add):
        secs = timeval.hour * 3600 + timeval.minute * 60 + timeval.second
        secs += secs_to_add
        return datetime.time(secs // 3600, (secs % 3600) // 60, secs % 60)
    

I can't help thinking that I'm missing an easier way to do this though.

### Related

  * [python time + timedelta equivalent](http://stackoverflow.com/questions/656297/python-time-timedelta-equivalent)


Answer: You can use full `datetime` variables with `timedelta`, and by providing a
dummy date then using `time` to just get the time value.

For example:

    
    
    import datetime
    a = datetime.datetime(100,1,1,11,34,59)
    b = a + datetime.timedelta(0,3) # days, seconds, then other fields.
    print a.time()
    print b.time()
    

results in the two values, three seconds apart:

    
    
    11:34:59
    11:35:02
    

You could also opt for the more readable

    
    
    b = a + datetime.timedelta(seconds=3)
    

if you're so inclined.

* * *

If you're after a function that can do this, you can look into using `addSecs`
below:

    
    
    import datetime
    
    def addSecs(tm, secs):
        fulldate = datetime.datetime(100, 1, 1, tm.hour, tm.minute, tm.second)
        fulldate = fulldate + datetime.timedelta(seconds=secs)
        return fulldate.time()
    
    a = datetime.datetime.now().time()
    b = addSecs(a, 300)
    print a
    print b
    

This outputs:

    
    
     09:11:55.775695
     09:16:55
    

