<human>:  Write me a Python function for changing timezone utc to est.
<bot>: Here is a Python function for changing timezone utc to est

import datetime

def change_timezone(timezone):
  """
  Change timezone utc to est.
  """
  return timezone + "-0500"

# Enter the timezone
timezone = "EST"

# Calling the function
new_timezone = change_timezone(timezone)

# Printing the new timezone
print(new_timezone)

#Example Output
# EST-0500

#Remember to inspect code for bugs.