Module generators 

Deterministic ID generators for German energy market identifiers.

Each generator takes a seed: u64 and produces a valid identifier of the appropriate format. Same seed always produces the same output.

Functions

compute_ymd

Compute (year, month, day) from 2024-01-01 + day_offset days.

days_per_month

Days per month for the given year (January = index 0).

generate_date_edifact102

Generate a date in CCYYMMDD format (EDIFACT 102).

generate_date_edifact303

Generate a date in CCYYMMDDHHMMSS+00 format (EDIFACT 303).

generate_date_ymd

Generate a date in YYYY-MM-DD format (HTML5 date input format).

generate_datum

Generate an interchange datum in YYMMDD format (used in UNB segment).

generate_gln

Generate a Global Location Number (GLN): 13 digits with valid GS1 check digit.

generate_malo_id

Generate a Marktlokation ID: 11 digits, the last one the BDEW check digit.

generate_melo_id

Generate a Messlokation ID: “DE” + 31 digits = 33 chars total.

generate_nelo_id

Generate a Netzlokation ID: “E” + 10 digits = 11 chars.

generate_reference_id

Generate an alphanumeric business reference ID safe for EDIFACT.

generate_steuress_id

Generate a Steuerbare Ressource ID: “C” + 10 digits = 11 chars.

generate_techress_id

Generate a Technische Ressource ID: “D” + 10 digits = 11 chars.

generate_zeit

Generate an interchange time in HHMM format (used in UNB segment).

is_leap_year

Return true if year is a leap year.

malo_check_digit

Check digit of a Marktlokations-ID over its first ten digits (BDEW): the digits at odd positions (1-based, from the left) plus twice those at even positions, and the check digit completes that sum to a multiple of ten. Unlike the Luhn algorithm, doubled digits are not reduced to one digit.