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Year zero in ODTs, LDTs, and LDs may be disallowed #1016

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Year zero in ODTs, LDTs, and LDs may be disallowed #1016

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2aa45db
Disallow year 0000 in Date-Time and Date values
eksortso Mar 2, 2024
7ac32f7
Replace year-zero ban with recommendation to avoid 0000
eksortso Mar 8, 2024
e9ce62b
Replace year-zero ban with recommendation to avoid 0000
eksortso Mar 8, 2024
058eee5
Merge branches of 'i1000-noyear0'
eksortso Mar 8, 2024
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1 change: 1 addition & 0 deletions CHANGELOG.md
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Expand Up @@ -2,6 +2,7 @@

## unreleased

- Year `0000` may be disallowed in Date-Times and Dates.
- Clarify Unicode and UTF-8 references.
- Relax comment parsing; most control characters are again permitted.
- Allow newline after key/values in inline tables.
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18 changes: 16 additions & 2 deletions toml.md
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Expand Up @@ -569,14 +569,22 @@ time with a space character (as permitted by RFC 3339 section 5.6).
odt4 = 1979-05-27 07:32:00Z
```

One exception to RFC 3339 is permitted: seconds may be omitted, in which case
`:00` will be assumed. The offset immediately follows the minutes.
Contrary to RFC 3339, seconds may be omitted, in which case `:00` will be assumed. The
offset immediately follows the minutes.

```toml
odt5 = 1979-05-27 07:32Z
odt6 = 1979-05-27 07:32-07:00
```

Date-times in the year `0000` may throw errors for technical reasons. Although some
platforms may recognize year-zero date-times, for the sake of interoperability, avoid
using year-zero date-times in TOML documents.

```toml
odt_year1 = 0001-01-01 00:00:00Z # NOTE: Earliest date-time guaranteed to be valid.
```

Millisecond precision is required. Further precision of fractional seconds is
implementation-specific. If the value contains greater precision than the
implementation can support, the additional precision must be truncated, not
Expand All @@ -601,6 +609,9 @@ Seconds may be omitted, in which case `:00` will be assumed.
ldt3 = 1979-05-27T07:32
```

Date-times in the year `0000` may throw errors for technical reasons. Avoid them in TOML
documents.

Millisecond precision is required. Further precision of fractional seconds is
implementation-specific. If the value contains greater precision than the
implementation can support, the additional precision must be truncated, not
Expand All @@ -616,6 +627,9 @@ represent that entire day without any relation to an offset or timezone.
ld1 = 1979-05-27
```

Dates in the year `0000` may throw errors for technical reasons. Avoid them in TOML
documents.

## Local Time

If you include only the time portion of an
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