convert gmt to chatham time in python

main.py
import datetime
import pytz

# create datetime object in GMT timezone
gmt = pytz.timezone('GMT')
dt_gmt = datetime.datetime.utcnow().replace(tzinfo=gmt)

# create timezone object for Chatham
chatham = pytz.timezone('Pacific/Chatham')

# convert the datetime object to Chatham timezone
dt_chatham = dt_gmt.astimezone(chatham)

print('GMT:    ', dt_gmt.strftime('%Y-%m-%d %H:%M:%S %Z%z'))
print('Chatham:', dt_chatham.strftime('%Y-%m-%d %H:%M:%S %Z%z'))
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main.py
GMT:     2021-10-05 09:34:08 GMT+0000
Chatham: 2021-10-05 21:19:08 NZDT+1300
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