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Python Dates and Times

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Time

2:52 with Rachel Johnson

In this video, we enter the world of time using Python's `datetime` module. We introduce the `time` class, which represents the passage of time since midnight in a day. Discover how to create time objects, set hours, minutes, and seconds, and access their properties.

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    [MUSIC] 0:00
    We start our venture into dates and 0:05
    times with the smaller of the measurements, time. 0:08
    The DateTime module has a class called Time that we use to handle, 0:12
    you guessed it, time. 0:17
    We access this class by calling the datetime module, and 0:19
    then the time class, like so. 0:23
    A time object represents the amount of time that has passed since midnight 0:27
    on any given day. 0:32
    To the computer a day has exactly 24 hours 60 minutes per hour, 0:35
    and 60 seconds per minute. 0:40
    So in order to create a time object for 0:44
    us to work with, we'll need to use the time class constructor. 0:47
    A time class constructor can take the hour, minute, 0:53
    second, and microsecond arguments. 0:57
    For example, hour equals 20, 1:01
    minute equals 30, and second equal 25. 1:04
    This will give us 8:30 and 25 seconds in the evening. 1:09
    According to the Python documentation, all of these arguments are optional. 1:14
    If we don't provide a microsecond value, which we didn't, this will default to 0. 1:20
    Let's give it a go in the terminal. 1:26
    Be sure to open up a Python interpreter using Python 3, and then import datetime. 1:29
    Typing in datetime.time will return datetime.time(0, 1:36
    0), because all the default values was 0. 1:42
    This means if we only want to specify the hour, 1:47
    we can simply use datetime.time(hour = 20). 1:52
    In fact, these arguments are also positional, so 1:57
    as long as our arguments go in the order of hour, minute, second, 2:00
    microsecond, we can omit the property names completely. 2:05
    For example, datetime.time(20) will simply give us 8PM. 2:10
    Datetime.time(20, 30) will give us 8:30PM. 2:18
    We can then access each of these properties as we normally do with objects. 2:25
    Let's create a variable to hold this time. 2:30
    t = datetime.time(20, 30). 2:33
    t.hour will return 20, 2:39
    t.minute will return 30, 2:43
    and t.second will return 0. 2:47

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