List dates from January 1, 1970 (UNIX Epoch) to 3000 AD, including leap years.
Dates are printed using ISO 8601 format.
The original shell script for generating days took several minutes,
prompting a rewrite in C.
Additional implementations were incorporated to explore the problem across
other languages.
cd to src/variant, then compile with the command from table below:
| Version | Run with | Runtime (≈) |
|---|---|---|
Rust (stdlib) |
cargo run -r |
36.6 ms |
Rust (chrono) |
cargo run -r |
45.5 ms |
| C | make gendate && ./gendate |
156 ms |
| Go | go run gendate.go |
234 ms |
| Tcl | ./gendate.tcl |
501 ms |
| Haskell | ghc gendate.hs && ./gendate |
715 ms |
| Python | ./gendate.py |
1.3 s |
| F# | dotnet run |
1.4 s |
| C# | dotnet run |
1.5 s |
| Scheme | csi gendate.scm |
1.5 s |
| Perl | ./gendate.pl |
2.3 s |
| Lua | ./gendate.lua |
3.3 s |
| Shell | ./gendate.sh |
10.5 m |
All programs were measured with hyperfine.
Each implementation produces output equivalent to:
$ ./gendate
1970-01-01
1970-01-02
1970-01-03
...
2999-12-30
2999-12-31
3000-01-01| Variant | Mean [ms] | Min [ms] | Max [ms] | Relative |
|---|---|---|---|---|
| C | 143.7 ± 4.4 | 140.5 | 168.9 | 1.00 |
| Rust | 228.3 ± 17.4 | 209.6 | 315.4 | 1.59 ± 0.13 |
| Go | 242.8 ± 12.2 | 225.1 | 274.1 | 1.69 ± 0.10 |
| Haskell | 659.5 ± 22.9 | 609.7 | 721.7 | 4.59 ± 0.21 |
| Scheme | 1684.5 ± 117.4 | 1504.4 | 2237.5 | 11.72 ± 0.89 |
All programs were measured with hyperfine.
This repository is licensed under the terms of the MIT License.
See the LICENSE file for details.