python datetime loader

datetime_loader.py

def load_datetime(value):
    from datetime import datetime
    if type(value) is str:
        import re
        JAVASCRIPT_DATE = re.compile(r'^\d{4}(?:-\d{2}){2}T(?:\d{2}:){2}\d{2}$')
        PYTHON_DATE = re.compile(r'^\d{4}(?:-\d{2}){2}\s(?:\d{2}:){2}\d{2}$')
        PYTHON_DATE_MICROSECONDS = re.compile(r'^\d{4}(?:-\d{2}){2}\s(?:\d{2}:){2}\d{2}\.\d+$')
        STRING_NUMBER = re.compile(r'^\d+(\.\d+)?$')
        if JAVASCRIPT_DATE.match(value):
            return datetime.strptime(value, '%Y-%m-%dT%H:%M:%S')
        elif PYTHON_DATE.match(value):
            return datetime.strptime(value, '%Y-%m-%d %H:%M:%S')
        elif PYTHON_DATE_MICROSECONDS.match(value):
            return datetime.strptime(value, '%Y-%m-%d %H:%M:%S.%f')
        elif STRING_NUMBER.match(value):
            return datetime.fromtimestamp(float(value))
        else:
            return None
    elif type(value) is int or type(value) is float:
        return datetime.fromtimestamp(value)
    else:
        return None