ludic/docs/language/datetime/datetime-parse.md at df6ea046c3122ad6090f19924aa17524fc3f88ba

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feat(stdlib): DateTime format/parse + simulated Clock — completes #9

Finish issue #9 by adding the two remaining acceptance items on top of the
calendar/clock core, still pure-integer and deterministic:

  DateTime.format(dt, pattern) -> string   render an instant via a token
                                           pattern (YYYY/YY/MM/DD/HH/mm/ss;
                                           other chars pass through)
  DateTime.parse(text, pattern) -> int     read an instant back; -1 on a
                                           non-digit where one is expected
  Clock.now/set/advance/reset              a game-controlled simulated clock
                                           (the @L_clock global) that never
                                           touches the wall clock, so gameplay
                                           reading Clock.now() is replay-safe

format/parse take a string-LITERAL pattern and are expanded at compile time
(field offsets are then constant), folding @fn_str_concat over literal runs and
two small runtime helpers: @fn_dt_pad0 (zero-padded field) and @fn_dt_rd
(fixed-width digit reader that stops at the terminator and flags malformed
input). Clock is a universal i32 global declared in emit_head, so it works in
entry and game programs alike.

Adds examples/offline_rewards.ludic — the issue's worked "you were away N hours"
example, driven from its own entry and asserted in the regression suite — plus
selfhost/tests/datetime2.ludic (format/parse round-trip, parse failure, clock),
docs (Clock section + 4 pages, DateTime.format/parse pages), inventory and LSP
hover. Reseeded; C-free fixpoint holds; all suites green (27 self-host / 46
regression / 29 tools); check.py (366 symbols), check-impl.py (218 ns-methods)
and validate.py OK.

With this, #9's scope is fully delivered: DateTime/Date/Duration + core ops,
format/parse, a deterministic simulated clock, docs + offline-rewards example,
and tests. (v1 stays UTC-only, no leap seconds, i32 epoch valid through 2038.)

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

2026-08-30 03:51:48 +03:00

888 B

Raw Blame History

id	name	category	kind	tokens	sig	tip	order	ns	member
datetime-parse	DateTime.parse	datetime	namespace-method	DateTime.parse	DateTime.parse(text, pattern) -> int	Parse text into an instant; -1 on failure.	11	DateTime	parse

Parses text into a DateTime by reading each token of pattern from the fixed position the pattern lays out; missing fields default to 1970-01-01 00:00:00. Returns -1 if a digit was expected but not found (so the caller can detect malformed input). The pattern must be a string literal and uses the same tokens as DateTime.format. text must match the pattern's fixed-width layout.

program Demo {
  handler Step phase Update {
    let t = DateTime.parse("2026-08-30 07:05:09", "YYYY-MM-DD HH:mm:ss")
    if t < 0 {
      # malformed input
    }
  }
}

888 B Raw Blame History

888 B

Raw Blame History