diff options
Diffstat (limited to 'src/calcurse.h')
| -rw-r--r-- | src/calcurse.h | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/src/calcurse.h b/src/calcurse.h index fb20da7..616d954 100644 --- a/src/calcurse.h +++ b/src/calcurse.h @@ -144,7 +144,13 @@ #define WEEKINMIN (WEEKINHOURS * HOURINMIN) #define WEEKINSEC (WEEKINMIN * MININSEC) #define DAYINMIN (DAYINHOURS * HOURINMIN) +/* + * Note the difference between the number of seconds in a day and daylength + * in seconds. The two may differ when DST is in effect (daylength is either + * 23, 24 or 25 hours. The argument to DAYLEN is of type time_t. + */ #define DAYINSEC (DAYINMIN * MININSEC) +#define DAYLEN(date) (date_sec_change((date), 0, 1) - (date)) #define HOURINSEC (HOURINMIN * MININSEC) #define MAXDAYSPERMONTH 31 |