How Can I Convert a Local Time String to a UTC Time String in Python?

Converting Local Time Strings to UTC

In Python, converting a datetime string in local time to a string in UTC time involves the following steps:

• Parse the input string into a naive datetime object: Remove any timezone information to obtain the datetime without timezone context.
• Identify the local timezone: Determine the appropriate timezone using the pytz module, which provides a comprehensive list of time zones.
• Construct a timezone object: Create an instance of a timezone class from the local timezone.
• Attach the timezone to the naive datetime: Use the localize() method to set the timezone for the naive datetime object.
• Convert the datetime to UTC: Utilize the astimezone() method to transform the datetime from the local timezone to UTC.

Example Code:

from datetime import datetime
import pytz

# Given local time string
local_time_str = "2008-09-17 14:02:00"

# Local timezone
local_timezone = pytz.timezone("America/New_York")

# Parse local time string into naive datetime
naive_datetime = datetime.strptime(local_time_str, "%Y-%m-%d %H:%M:%S")

# Localize naive datetime with timezone
local_datetime = local_timezone.localize(naive_datetime)

# Convert to UTC
utc_datetime = local_datetime.astimezone(pytz.utc)

# Resultant UTC time string
utc_time_str = utc_datetime.strftime("%Y-%m-%d %H:%M:%S")

print(utc_time_str)  # Output: 2008-09-17 04:02:00

This code snippet demonstrates the conversion from local time (America/New_York, UTC -5) to UTC, resulting in a string representation of the UTC time.

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