Add a birthDate field to the JSON user record, stored internally as a struct tm with INT_MIN/negative sentinels for unset fields. The field is serialized as a YYYY-MM-DD string in JSON and validated via parse_birth_date(), which shares its core logic with parse_calendar_date() through a new parse_calendar_date_full() function. For birth dates, timegm() is called directly (rather than mktime_or_timegm_usec) to support pre-epoch dates. The wday field is used to distinguish timegm() failure from a valid (time_t) -1 return. birthDate is excluded from user_record_self_modifiable_fields(), so only administrators can set or change it via homectl. The field remains in the regular (non-privileged) JSON section, keeping it readable by the user and applications.
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