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Showing content from https://cplusplus.github.io/LWG/issue4022 below:

Ambiguity in the formatting of negative years with format specifier %C

This page is a snapshot from the LWG issues list, see the Library Active Issues List for more information and the meaning of New status.

4022. Ambiguity in the formatting of negative years with format specifier %C

Section: 30.12 [time.format] Status: New Submitter: Jiang An Opened: 2023-12-08 Last modified: 2023-12-09

Priority: Not Prioritized

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Discussion:

Table 101, [tab:time.format.spec] reads:

Table 101 — Meaning of conversion specifiers [tab:time.format.spec] Specifier Replacement […] %C The year divided by 100 using floored division. If the result is a single decimal digit, it
is prefixed with 0. The modified command %EC produces the locale's alternative
representation of the century. […]

When the year is in range [-99, -10], it is unclear whether the result (in range [-9, -1]) is considered as a single decimal digit, and there is implementation divergence (llvm/llvm-project#74727).

Daniel: This issue is somewhat related to LWG 3831(i).

Proposed resolution:

This wording is relative to N4964.

[Drafting Note: Two mutually exclusive options are prepared, depicted below by Option A and Option B, respectively.]

Option A:

  1. Modify 30.12 [time.format], Table 101 [tab:time.format.spec], as indicated:

    Table 101 — Meaning of conversion specifiers [tab:time.format.spec] Specifier Replacement […] %C The year divided by 100 using floored division. If the result is a single decimal digit in range [0, 9], it
    is prefixed with 0. The modified command %EC produces the locale's alternative
    representation of the century. […]

Option B:

  1. Modify 30.12 [time.format], Table 101 [tab:time.format.spec], as indicated:

    Table 101 — Meaning of conversion specifiers [tab:time.format.spec] Specifier Replacement […] %C The year divided by 100 using floored division. If the result is a single decimal digit in range [-9, 9], it
    is prefixed with 0. The modified command %EC produces the locale's alternative
    representation of the century. […]

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