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Data Structures | |
struct | YearMonthDay |
Data structure to convert between Date and triplet (year, month, and day). More... | |
Defines | |
#define | ORIGINAL_BASE_YEAR 1920 |
The minimum starting year/base year of the original TTD. | |
#define | ORIGINAL_END_YEAR 2051 |
The original ending year. | |
#define | ORIGINAL_MAX_YEAR 2090 |
The maximum year of the original TTD. | |
#define | DAYS_TILL_ORIGINAL_BASE_YEAR (DAYS_IN_YEAR * ORIGINAL_BASE_YEAR + ORIGINAL_BASE_YEAR / 4 - ORIGINAL_BASE_YEAR / 100 + ORIGINAL_BASE_YEAR / 400) |
The offset in days from the '_date == 0' till 'ConvertYMDToDate(ORIGINAL_BASE_YEAR, 0, 1)'. | |
#define | MIN_YEAR 0 |
#define | MAX_YEAR 5000000 |
Typedefs | |
typedef int32 | Date |
typedef uint16 | DateFract |
typedef int32 | Year |
typedef uint8 | Month |
typedef uint8 | Day |
Enumerations | |
enum | { DAY_TICKS = 74, DAYS_IN_YEAR = 365, DAYS_IN_LEAP_YEAR = 366 } |
1 day is 74 ticks; _date_fract used to be uint16 and incremented by 885. More... | |
Variables | |
static const Year | INVALID_YEAR = -1 |
static const Date | INVALID_DATE = -1 |
Definition in file date_type.h.
anonymous enum |
1 day is 74 ticks; _date_fract used to be uint16 and incremented by 885.
On an overflow the new day begun and 65535 / 885 = 74. 1 tick is approximately 30 ms. 1 day is thus about 2 seconds (74 * 30 = 2220) on a machine that can run OpenTTD normally
DAY_TICKS | ticks per day |
DAYS_IN_YEAR | days per year |
DAYS_IN_LEAP_YEAR | sometimes, you need one day more... |
Definition at line 14 of file date_type.h.