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import calendar
from datetime import datetime, timedelta

def get_timestamp(datetime_obj):
    return calendar.timegm(datetime_obj.timetuple())

if __name__ == "__main__":
    print(get_timestamp(datetime.now()))
    print(get_timestamp(datetime.now() + timedelta(days=30)))
    print(get_timestamp(datetime.now() + timedelta(days=365)))