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

Conversion of Local Time String to UTC

Converting a datetime string in local time to its corresponding UTC equivalent can be achieved through a series of steps.

Step 1: Parsing the String

Initialize the string as a "naive" datetime object, which lacks any explicit timezone information.

Step 2: Determining Local Timezone

Using the pytz library, identify the local timezone and create a corresponding timezone object.

Step 3: Local Timezone Manipulation

Attach the local timezone information to the naive datetime object.

Step 4: UTC Conversion

Utilize the astimezone() method of the local timezone object to convert the datetime to UTC.

Step 5: Formatting

Format the UTC datetime string using the strftime() method as required.

Example Code

Consider a local timezone of "America/Los_Angeles" and a datetime string "2001-2-3 10:11:12".

from datetime import datetime
import pytz

# Parse the datetime string into a naive object
naive = datetime.strptime("2001-2-3 10:11:12", "%Y-%m-%d %H:%M:%S")

# Determine the local timezone
local = pytz.timezone("America/Los_Angeles")

# Attach the local timezone to the naive datetime
local_dt = local.localize(naive, is_dst=None)

# Convert to UTC
utc_dt = local_dt.astimezone(pytz.utc)

# Format the UTC datetime string
utc_date_string = utc_dt.strftime("%Y-%m-%d %H:%M:%S")

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