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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
 *  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

#define FOUR_DIGIT_YEAR(y) ((y < 50)? y + 2000 : y + 1900)

long get_epoch_day (const char *date);

int get_day_of_week (const char *date);

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 DATAINFO *pdinfo);

void calendar_date_string (char *str, int t, const DATAINFO *pdinfo);

int MS_excel_date_string (char *date, int mst, int pd, int d1904);

double get_dec_date (const char *date);

int n_hidden_missing_obs (const DATAINFO *pdinfo);

int guess_daily_pd (const DATAINFO *pdinfo);

#endif /* CALENDAR_H */ 

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