should be it

external/duckdb/extension/tpcds/dsdgen/include/dsdgen-c/date.h

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+/*
+ * Legal Notice
+ *
+ * This document and associated source code (the "Work") is a part of a
+ * benchmark specification maintained by the TPC.
+ *
+ * The TPC reserves all right, title, and interest to the Work as provided
+ * under U.S. and international laws, including without limitation all patent
+ * and trademark rights therein.
+ *
+ * No Warranty
+ *
+ * 1.1 TO THE MAXIMUM EXTENT PERMITTED BY APPLICABLE LAW, THE INFORMATION
+ *     CONTAINED HEREIN IS PROVIDED "AS IS" AND WITH ALL FAULTS, AND THE
+ *     AUTHORS AND DEVELOPERS OF THE WORK HEREBY DISCLAIM ALL OTHER
+ *     WARRANTIES AND CONDITIONS, EITHER EXPRESS, IMPLIED OR STATUTORY,
+ *     INCLUDING, BUT NOT LIMITED TO, ANY (IF ANY) IMPLIED WARRANTIES,
+ *     DUTIES OR CONDITIONS OF MERCHANTABILITY, OF FITNESS FOR A PARTICULAR
+ *     PURPOSE, OF ACCURACY OR COMPLETENESS OF RESPONSES, OF RESULTS, OF
+ *     WORKMANLIKE EFFORT, OF LACK OF VIRUSES, AND OF LACK OF NEGLIGENCE.
+ *     ALSO, THERE IS NO WARRANTY OR CONDITION OF TITLE, QUIET ENJOYMENT,
+ *     QUIET POSSESSION, CORRESPONDENCE TO DESCRIPTION OR NON-INFRINGEMENT
+ *     WITH REGARD TO THE WORK.
+ * 1.2 IN NO EVENT WILL ANY AUTHOR OR DEVELOPER OF THE WORK BE LIABLE TO
+ *     ANY OTHER PARTY FOR ANY DAMAGES, INCLUDING BUT NOT LIMITED TO THE
+ *     COST OF PROCURING SUBSTITUTE GOODS OR SERVICES, LOST PROFITS, LOSS
+ *     OF USE, LOSS OF DATA, OR ANY INCIDENTAL, CONSEQUENTIAL, DIRECT,
+ *     INDIRECT, OR SPECIAL DAMAGES WHETHER UNDER CONTRACT, TORT, WARRANTY,
+ *     OR OTHERWISE, ARISING IN ANY WAY OUT OF THIS OR ANY OTHER AGREEMENT
+ *     RELATING TO THE WORK, WHETHER OR NOT SUCH AUTHOR OR DEVELOPER HAD
+ *     ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES.
+ *
+ * Contributors:
+ * Gradient Systems
+ */
+#ifndef R_DATE_H
+#define R_DATE_H
+
+#include "mathops.h"
+
+typedef struct DATE_T {
+	int flags;
+	int year;
+	int month;
+	int day;
+	int julian;
+} date_t;
+
+date_t *mk_date(void);
+
+int jtodt(date_t *dest, int i);
+int strtodt(date_t *dest, char *s);
+int strtotime(char *str);
+
+char *dttostr(date_t *d);
+int dttoj(date_t *d);
+
+int date_t_op(date_t *dest, int o, date_t *d1, date_t *d2);
+int set_dow(date_t *d);
+int is_leap(int year);
+int day_number(date_t *d);
+int date_part(date_t *d, int p);
+int set_outfile(int i);
+int getDateWeightFromJulian(int jDay, int nDistribution);
+#define CENTURY_SHIFT 20 /* years before this are assumed to be 2000's */
+/*
+ * DATE OPERATORS
+ */
+#define OP_FIRST_DOM 0x01 /* get date of first day of current month */
+#define OP_LAST_DOM  0x02 /* get date of last day of current month; LY == 2/28) */
+#define OP_SAME_LY   0x03 /* get date for same day/month, last year */
+#define OP_SAME_LQ   0x04 /* get date for same offset in the prior quarter */
+
+extern char *weekday_names[];
+
+#endif /* R_DATE_H */