/*----------------------------------------------------------------------*\
 | Utility routines to convert FIPS dates to and from struct tm			|
 |																		|
 | Routines that write date as string to address given by argument:		|
 | tm_to_yd		from struct tm, generate FIPS date in YYDDD form		|
 | tm_to_yyd	from struct tm, generate FIPS date in YYYYDDD form		|
 | tm_to_ymd	from struct tm, generate FIPS date in YYMMDD form		|
 | tm_to_yymd	from struct tm, generate FIPS date in YYYYMMDD form		|
 |																		|
 | Routines that dynamically allocate struct tm and return its address:	|
 | ymd_to_tm	from FIPS date as YYMMDD or YYYYMMDD, make struct tm	|
 | yd_to_tm		from FIPS date as YYDDD or YYYYDDD, make struct tm		|
 | get_tm		from FIPS date and time (HHMM), make struct tm			|
 |																		|
 | Routines that modify the time data passed by reference				|
 | next_day		modify struct tm by adding one day						|
 | increment_yd	modify FIPS date in YYDDD form by adding one day		|
 |																		|
 | Peter N. Schweitzer (U.S. Geological Survey, Reston, VA 22092)		|
\*----------------------------------------------------------------------*/

extern size_t tm_to_yd (char *dst, const struct tm *tm);
extern size_t tm_to_yyd (char *dst,const struct tm *tm);
extern size_t tm_to_ymd (char *dst, const struct tm *tm);
extern size_t tm_to_yymd (char *dst, const struct tm *tm);
extern struct tm *ymd_to_tm (const char *ymd);
extern struct tm *yd_to_tm (const char *yd);
extern struct tm *get_tm (char *ds, char *ts);
extern void next_day (struct tm *tm);
extern void increment_yd (char *yyddd);

/*----------------------------------------------------------------------*\
\*----------------------------------------------------------------------*/