date_type.h File Reference

Types related to the dates in OpenTTD. More...

Go to the source code of this file.

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


Detailed Description

Types related to the dates in OpenTTD.

Definition in file date_type.h.


Enumeration Type Documentation

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

Enumerator:
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.


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