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Converting datetime Objects to Seconds in Python

Problem:

You have multiple datetime objects and need to calculate the number of seconds that have passed since a fixed time in the past (e.g., January 1, 1970) for each object. While t.toordinal() seems to differentiate only between dates with different days, you aim for a more precise conversion to seconds.

Solution:

For the specific date of January 1, 1970, you have several options:

• Convert to a time object and use mktime():

  <code class="python">import time
  time.mktime(t.timetuple())</code>

• Use the total_seconds() method of a timedelta object (available in Python 2.7 and later):

  <code class="python">from datetime import timedelta
  (t - datetime.datetime(1970, 1, 1)).total_seconds()</code>

For any other starting date, you need to subtract the two dates to get a timedelta object and then use its total_seconds() function:

<code class="python">from datetime import datetime, timedelta
(t - datetime.datetime(2000, 1, 1)).total_seconds()</code>

Remember that the starting date is typically specified in UTC. If your datetime object is not in UTC, convert it before using it, or provide a tzinfo class with the correct offset.

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