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Dylan M. Taylor acd109d97c Use chrono instead of hand-rolled UTC conversion (#1789)
* Use chrono for UTC/calendar conversion instead of hand-rolled copies

Replaces the three civil_from_days copies (logging timestamp, Drawing
Recovery time, parity checklist date) with chrono as a workspace
dependency. Output formats are unchanged and pinned by the existing tests.
AGENTS.md now says time goes through chrono.

Fixes #1785

* Never panic on a clock outside chrono's range; keep 5-digit years unprefixed

chrono's From<SystemTime> unwraps, so a clock past year 262143 panicked
inside the logger. timestamp and xtask's date now use the fallible
DateTime::from_timestamp and read such a clock as the epoch, as the old
saturating code did. xtask's date also clamps a pre-epoch clock to
1970-01-01 again. Years past 9999 are written with {:04} like before,
because %Y would add a '+'. Tests cover all three cases.

* Don't build an unrepresentable SystemTime in the far-future test

UNIX_EPOCH + Duration::from_secs(u64::MAX / 2) overflows Windows'
SystemTime and panicked before timestamp() ran, failing the Windows
test job. Build it with checked_add and only assert where it exists.

* logging/autosave/parity: keep extended-year dates, no epoch fallback

Applies the stricter no-epoch-fallback rule (from wordcraft#3427 / filmcraft#2662,
superseding the earlier epoch-or-last-valid suggestion) so all sibling PRs agree:
a timestamp the old code converted past chrono's year 262143 range must keep its real
proleptic-Gregorian date, not collapse to 1970-01-01. Each site uses the 400-year
Gregorian cycle (146_097 days) with chrono as the only calendar logic: chrono converts
the day within one cycle, whole cycles carry in the year (i128, saturated into i64).
This also removes the panic FredApps flagged — `DateTime::<Utc>::from(SystemTime)` could
panic past chrono's range; `from_num_days_from_ce_opt` within one cycle never does.
Verified the cycle result equals the old formula across a wide range and at the extremes.

- apps/cadcraft/src/logging.rs `timestamp`: cycle `civil_from_days(u64)`; pre-1970 epoch
  clamp and ms/time-of-day format kept. Pins: +10_000_000_000_000 s -> 318857-05-20T17:46:40.000Z
  (was 1970-...); checked_add u64::MAX/2 s -> 292277026596-12-04T15:30:07.000Z (was epoch).
- crates/ui-egui/src/autosave.rs `utc`: cycle converter. Pins: utc(10_000_000_000_000)
  = "318857-05-20 17:46"; utc(u64::MAX) = "584554051223-11-09 07:00" (was "1970-01-01 00:00").
- xtask/src/parity.rs `date`: cycle converter; pre-1970 epoch clamp kept. Pins:
  day(115_740_740) = "318857-05-20"; checked_add u64::MAX/2 s -> "292277026596-12-04" (was epoch).

* Don't build a year-318857 SystemTime unchecked in the logging test

Windows' SystemTime only reaches about year 30828, so
UNIX_EPOCH + Duration::from_secs(10_000_000_000_000) panicked before
timestamp() ran and failed the Windows test job. Build it with
checked_add and assert where the platform can hold it. The year-10000
case fits everywhere and stays unconditional.

* Name the 400-year range extension as the one exception to the time rule

The rule said never to hand-roll calendar math, but the range fix
(shifting by whole 400-year Gregorian cycles so dates past chrono's year
range keep their old output) is cycle arithmetic, so the rule and the code
disagreed. The rule now names that exception: the library still computes
month, day and time, and only whole cycles are carried in the year.

* Say the library computes month and day; time-of-day is plain arithmetic

Narrows the range-extension wording: the date library computes the
calendar fields, and splitting seconds into hours, minutes and seconds
is ordinary arithmetic, which is what the code does.
2026-10-22 14:09:16 -04:00

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TOML

[workspace]
resolver = "3"
members = ["crates/*", "apps/*", "xtask"]
# default-members
[workspace.package]
version = "0.10.0"
edition = "2024"
license = "MIT OR Apache-2.0"
rust-version = "1.90"
repository = "https://github.com/storytold/cadcraft"
[workspace.dependencies]
# internal
cadcraft-geom = { path = "crates/geom" }
cadcraft-dxf = { path = "crates/dxf" }
cadcraft-dwg = { path = "crates/dwg" }
cadcraft-color = { path = "crates/color" }
cadcraft-doc = { path = "crates/doc" }
cadcraft-constraints = { path = "crates/constraints" }
cadcraft-fonts = { path = "crates/fonts" }
cadcraft-render = { path = "crates/render" }
cadcraft-io = { path = "crates/io" }
cadcraft-engine = { path = "crates/engine" }
cadcraft-ui-egui = { path = "crates/ui-egui" }
cadcraft-mcp = { path = "crates/mcp" }
# Which paths stored in a drawing (xrefs, data links) may be opened.
craft-docpath = { version = "0.1.0", git = "https://github.com/storytold/craft-libs", rev = "82a24b006eefa036b43c09a67fb9a3fbd17ffe63" }
# foundation
thiserror = "2"
serde = { version = "1", features = ["derive", "rc"] }
serde_json = { version = "1", features = ["float_roundtrip"] }
log = "0.4"
# All date/time conversion goes through chrono (no hand-rolled calendar code beyond the 400-year range extension; AGENTS.md).
chrono = { version = "0.4.45", default-features = false, features = ["std"] }
rayon = "1"
# rendering / formats
tiny-skia = { version = "0.11", default-features = false, features = ["std", "simd", "png-format"] }
lyon_tessellation = "1.0.22"
skrifa = "0.47"
# Text shaping (OpenType GSUB/GPOS, HarfBuzz port on read-fonts; the version egui's epaint uses)
# and the Unicode Bidirectional Algorithm for right-to-left drawing text.
harfrust = "0.12"
unicode-bidi = "0.3.18"
image = { version = "0.25", default-features = false, features = ["png", "jpeg"] }
encoding_rs = "0.8.35"
# XML for the SVG reader (streaming parser, no entity expansion beyond the five predefined ones)
quick-xml = "0.41"
# ui
craft-ui = { version = "0.1.0", git = "https://github.com/storytold/craft-libs", rev = "5c874d51eeb3de70e735c8ce87a59a7dedd47675", features = ["serde"] }
egui = "0.36"
egui_kittest = "0.36"
eframe = { version = "0.36", default-features = false }
egui-wgpu = "0.36"
rfd = "0.17"
arboard = { version = "3.6", default-features = false }
[workspace.lints.rust]
unsafe_code = "forbid"
[workspace.lints.clippy]
dbg_macro = "warn"
todo = "warn"
too_many_arguments = "allow"
type_complexity = "allow"
[profile.dev.package."*"]
opt-level = 2
[profile.dev]
opt-level = 1
[profile.release]
opt-level = 3
lto = "thin"
codegen-units = 16
debug = 0