Modifying Date

from dateutil.parser import parse
from dateutil.relativedelta import relativedelta
from datetime import datetime, date
import re
​
def get_flattened_meta():
    flattened = dict()
    for m in document.get_meta_data():
        for metadata_name, metadata_values in m.values.items():
            flattened[metadata_name.lower()] = metadata_values
    normalized = dict()
    for metadata_name, metadata_values in flattened.items():
        if len(metadata_values) == 1:
            normalized[metadata_name] = metadata_values[0]
        elif len(metadata_values) > 1:
            normalized[metadata_name] = ';'.join([str(value) for value in metadata_values])
    return normalized
​
def convert_date(date_string, default):
    try:
        return parse(date_string) - relativedelta(years=1)
    except ValueError:
        return default
def parse_date_with_trigger(date_string, default):
    try:
        return parse(date_string) if parse(date_string) > datetime(1960, 1, 1) else parse(date_string)
    except ValueError:
        return default
​
meta_data = get_flattened_meta()
​
# When the metadata is wrong and you don't have any date, it puts it one year before
document.add_meta_data({'Date':str(parse_date_with_trigger(meta_data['modificationdate'], date.today()) \
                                          if 'modificationdate' in meta_data else date.today())})
document.add_meta_data({'Date':str(convert_date(meta_data['Date'], date.today()) \
                                          if 'Date' in meta_data else date.today())})