How to Add Seconds to a datetime.time Object in Python?

Adding Seconds to datetime.time in Python

Developers often encounter the need to manipulate time values in Python. Among the various datetime components, datetime.time represents a time of day without a date component. To add an integer number of seconds to a datetime.time object, we require a standard and efficient method.

Conventional Approaches

Attempting to directly add an integer to a datetime.time value or using a timedelta with a time object results in type errors. Custom functions like add_secs_to_time() have been developed to address this issue.

Efficient Solution

However, a more elegant and Pythonic solution exists. By converting the datetime.time object to a full datetime instance with a dummy date, we can leverage the timedelta to add seconds. For example:

<code class="python">import datetime

timeval = datetime.time(11, 34, 59)
secs_to_add = 3
dt = datetime.datetime(100, 1, 1, timeval.hour, timeval.minute, timeval.second)  # Dummy date
dt += datetime.timedelta(seconds=secs_to_add)
result_time = dt.time()</code>

This approach produces the expected result: 11:35:02. It retains the original time information while incrementing the seconds accurately.

Helper Function

For convenience, we can create a reusable function called addSecs:

<code class="python">def addSecs(tm, secs):
    fulldate = datetime.datetime(100, 1, 1, tm.hour, tm.minute, tm.second)
    fulldate += datetime.timedelta(seconds=secs)
    return fulldate.time()</code>

Using this function, we can manipulate datetime.time values with ease:

<code class="python">a = datetime.datetime.now().time()
b = addSecs(a, 300)</code>

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