How to get UTC time in Python?

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Use datetime.utcnow():

from datetime import datetime
datetime.utcnow()

For your purposes when you need to calculate an amount of time spent between two dates all that you need is to subtract end and start dates. The results of such subtraction is a timedelta object.

From the python docs:

class datetime.timedelta([days[, seconds[, microseconds[, milliseconds[, minutes[, hours[, weeks]]]]]]])

And this means that by default you can get any of the fields mentioned in it’s definition –
days, seconds, microseconds, milliseconds, minutes, hours, weeks. Also timedelta instance has total_seconds() method that:

Return the total number of seconds contained in the duration.
Equivalent to (td.microseconds + (td.seconds + td.days * 24 * 3600) *
106) / 106 computed with true division enabled.

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