diff options
author | rubidium <rubidium@openttd.org> | 2006-08-20 18:40:57 +0000 |
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committer | rubidium <rubidium@openttd.org> | 2006-08-20 18:40:57 +0000 |
commit | 28a08437075be6495df383ca854f6026965a8b8e (patch) | |
tree | 146ad5e3c72a49bcc04fae58e750b972f063d8c2 /date.h | |
parent | 5e4667624e5093ea2b83bcdf63d836d1a34d46bc (diff) | |
download | openttd-28a08437075be6495df383ca854f6026965a8b8e.tar.xz |
(svn r5999) -Feature: change the original date format to a 32 bits format based at the year 0.
The game date subsystem now allows someone to start in the year 0 and continue
up to the year 5 000 000. However, you currently cannot build anything before
1920 as there is no newgrf support for dates before 1920 or after 2090 yet.
Diffstat (limited to 'date.h')
-rw-r--r-- | date.h | 10 |
1 files changed, 6 insertions, 4 deletions
@@ -24,14 +24,16 @@ * The offset in days from the '_date == 0' till * 'ConvertYMDToDate(ORIGINAL_BASE_YEAR, 0, 1)' */ -#define DAYS_TILL_ORIGINAL_BASE_YEAR 0 +#define DAYS_TILL_ORIGINAL_BASE_YEAR (365 * ORIGINAL_BASE_YEAR + ORIGINAL_BASE_YEAR / 4 - ORIGINAL_BASE_YEAR / 100 + ORIGINAL_BASE_YEAR / 400) /* Temporary value to make transition to full past 2090 easier/more clear */ -#define BASE_YEAR 1920 +#define BASE_YEAR 0 /* The absolute minimum & maximum years in OTTD */ -#define MIN_YEAR 1920 -#define MAX_YEAR 2090 +#define MIN_YEAR 0 +/* MAX_YEAR, nicely rounded value of the number of years that can + * be encoded in a single 32 bits date, about 2^31 / 366 years. */ +#define MAX_YEAR 5000000 /* Year and Date are defined elsewhere */ typedef uint8 Month; |