37 lines
1.4 KiB
TypeScript
37 lines
1.4 KiB
TypeScript
export declare const DAYS_BEFORE_MONTH: number[];
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/**
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* year -> 1 if leap year, else 0
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*/
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export declare function isLeap(year: number): boolean;
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/**
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* year, month -> number of days in that month in that year.
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*/
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export declare function _daysInMonth(year: number, month: number): number;
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/**
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* ordinal -> (year, month, day), considering 01-Jan-0001 as day 1.
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*
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* n is a 1-based index, starting at 1-Jan-1. The pattern of leap years
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* repeats exactly every 400 years. The basic strategy is to find the
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* closest 400-year boundary at or before n, then work with the offset
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* from that boundary to n. Life is much clearer if we subtract 1 from
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* n first -- then the values of n at 400-year boundaries are exactly
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* those divisible by _DI400Y:
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*
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* D M Y n n-1
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* -- --- ---- ---------- ----------------
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* 31 Dec -400 -_DI400Y -_DI400Y -1
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* 1 Jan -399 -_DI400Y +1 -_DI400Y 400-year boundary
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* ...
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* 30 Dec 000 -1 -2
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* 31 Dec 000 0 -1
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* 1 Jan 001 1 0 400-year boundary
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* 2 Jan 001 2 1
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* 3 Jan 001 3 2
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* ...
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* 31 Dec 400 _DI400Y _DI400Y -1
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* 1 Jan 401 _DI400Y +1 _DI400Y 400-year boundary
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*
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*
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*/
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export declare function ord2ymd(n: number): [number, number, number];
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