tf-ner-poc/src/main/python/normalizer/date_generator.py

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from faker import Faker
from babel.dates import format_date
import random
from datetime import datetime

fake = Faker()

# TOOD: If possible set date range on Faker

FORMATS = ['short',
           'medium',
           'long',
           'dd MMM YYY',
           'dd MMM',
           'dd, MMM YYY',
           'dd, MMM',
           'd MMM YYY',
           'd MMM',
           'd MMMM YYY',
           'MMMM YYY',
           'd MMMM, YYY',
           'd MMM, YYY',
           'd MM YY',
           'd MMMM YYY',
           'MMMM d YYY',
           'MMMM YYY',
           'MMM YYY',
           'MMMM d, YYY',
           'YYY',
           'dd.MM.YY',
           'dd.MM',
           'full',
           'full',
           'full',
           'full',
           'full',
           'full',
           'full',
           'full',
           'full',
           'full']

# TODO: maybe avoid duplicates, output dates also for other locales such as german, and french ...

with open('date_dev_deu.txt', 'w', encoding="utf-8") as f:
    for i in range(2000):
        dt = fake.date_time_ad(start_datetime=datetime(1900, 1, 1))

        format = random.choice(FORMATS)
        source_date = format_date(dt, format=format,  locale='en_US')
        target_date = format_date(dt, format='YYYYMMdd',  locale='en_US')

        if "short" not in format \
                and "medium" not in format \
                and "long" not in format \
                and "full" not in format :

            if "Y" not in format:
                target_date = "0000" + target_date[4:]

            if "d" not in format:
                target_date = target_date[:6] + "00"

            if "M" not in format:
                target_date = target_date[:4] + "00" + target_date[6:]

        f.write(target_date + '\t' + source_date + '\n')