Datetimes (Datetime)

Datetime validator parses using the python-dateutil library and returns a python datetime object.

Example yaml_snippet:

date: 2016-10-22
datetime1: 2016-10-22T14:23:12+00:00
datetime2: 2016-10-22T14:23:12Z
datetime3: 20161022T142312Z
from strictyaml import Map, Datetime, YAMLValidationError, load, as_document
from collections import OrderedDict
from dateutil.tz.tz import tzutc
from datetime import datetime
from ensure import Ensure

schema = Map({
    "date": Datetime(),
    "datetime1": Datetime(),
    "datetime2": Datetime(),
    "datetime3": Datetime(),
})

equivalent_data = OrderedDict([
    ("date", datetime(2016, 10, 22, 0, 0)),
    ("datetime1", datetime(2016, 10, 22, 14, 23, 12, tzinfo=tzutc())),
    ("datetime2", datetime(2016, 10, 22, 14, 23, 12, tzinfo=tzutc())),
    ("datetime3", datetime(2016, 10, 22, 14, 23, 12, tzinfo=tzutc())),
])

Each of the four datetimes are valid and parsed:

Ensure(load(yaml_snippet, schema)).equals(equivalent_data)

.text still returns the original text:

Ensure(load(yaml_snippet, schema)["date"].text).equals("2016-10-22")

Non datetimes raise an exception:

date: 1
datetime1: รข
datetime2: b
datetime3: c
load(yaml_snippet, schema)
strictyaml.exceptions.YAMLValidationError:
when expecting a datetime
found arbitrary text
  in "<unicode string>", line 2, column 1:
    datetime1: "\xE2"
    ^ (line: 2)

Datetime objects serialize directly to ISO-8601 format YAML strings:

print(as_document(equivalent_data, schema).as_yaml())
date: 2016-10-22T00:00:00
datetime1: 2016-10-22T14:23:12+00:00
datetime2: 2016-10-22T14:23:12+00:00
datetime3: 2016-10-22T14:23:12+00:00

Valid datetime strings serialize to YAML:

print(as_document({"a": "2016-10-22"}, Map({"a": Datetime()})).as_yaml())
a: 2016-10-22

Serializing invalid datetime string raises exception:

as_document({"a": "x"}, Map({"a": Datetime()}))
strictyaml.exceptions.YAMLSerializationError:
expected a datetime, got 'x'

Serializing non-string and non-datetime object raises exception:

as_document({"a": 55}, Map({"a": Datetime()}))
strictyaml.exceptions.YAMLSerializationError:
expected a datetime, got '55' of type 'int'

Executable specification

Page automatically generated from datetime.story.