/usr/include/gretl/calendar.h is in libgretl1-dev 1.9.92-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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* gretl -- Gnu Regression, Econometrics and Time-series Library
* Copyright (C) 2001 Allin Cottrell and Riccardo "Jack" Lucchetti
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
#ifndef CALENDAR_H
#define CALENDAR_H
/**
* FOUR_DIGIT_YEAR:
* @y: year given to only two digits.
*
* Returns: a guess at the 4-digit year intended when
* two digits were provided. But really, who knows?
*/
#define FOUR_DIGIT_YEAR(y) ((y < 50)? y + 2000 : y + 1900)
long epoch_day_from_ymd (int y, int m, int d);
char *ymd_extended_from_epoch_day (long ed, int *err);
double ymd_basic_from_epoch_day (long ed, int *err);
int iso_basic_to_extended (const double *b, double *y, double *m,
double *d, int n);
long get_epoch_day (const char *date);
int weekday_from_date (const char *date);
int weekday_from_epoch_day (long ed);
int day_starts_month (int d, int m, int y, int wkdays, int *pad);
int day_ends_month (int d, int m, int y, int wkdays);
int get_days_in_month (int mon, int yr, int wkdays);
int days_in_month_before (int yr, int mon, int day, int wkdays);
int days_in_month_after (int yr, int mon, int day, int wkdays);
int calendar_obs_number (const char *date, const DATASET *dset);
int calendar_date_string (char *str, int t, const DATASET *dset);
int MS_excel_date_string (char *date, int mst, int pd, int d1904);
double get_dec_date (const char *date);
double day_of_week (int yr, int mo, int day, int *err);
int n_hidden_missing_obs (const DATASET *dset);
int guess_daily_pd (const DATASET *dset);
double easterdate (int year);
#endif /* CALENDAR_H */
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