Module datetime 

ISO 8601 date and datetime validation rules for ISO 20022 messages.

ISO 20022 uses two date-like types:

• ISODateTime: YYYY-MM-DDThh:mm:ss[.sss][Z|+hh:mm|-hh:mm]
• ISODate: YYYY-MM-DD

Structural validation is performed without an external calendar library: ranges are enforced for each field, but calendar semantics (e.g. Feb 30) are intentionally not checked, as ISO 20022 schemas also don’t prohibit them at the lexical level.

Structs

IsoDateRule

Validates a value as an ISO 8601 date string in the format used by ISO 20022: YYYY-MM-DD.

IsoDateTimeRule

Validates a value as an ISO 8601 datetime string in the format used by ISO 20022: YYYY-MM-DDThh:mm:ss[.sss][Z|+hh:mm|-hh:mm].