date.h

Go to the documentation of this file.

/* date.h - ntim2xtim, xtim2ntim, isleap, utim2ltim */

/************************************************************************/
/*                                  */
/*  Constants and declarations for date storage and conversion  */
/*                                  */
/*   Xinu stores time as seconds past Jan 1, 1970 (UNIX format), with   */
/* 1 being 1 second into Jan. 1, 1970, GMT (universal time).  The   */
/* Internet uses seconds past Jan 1, 1900 (also GMT or Universal Time)  */
/*                                  */
/************************************************************************/

/* Conversion between network and local representations */

#define ntim2xtim(x)  ((x)-2208988800U) /* net-to-xinu time     */
#define xtim2ntim(x)  ((x)+2208988800U) /* xinu-to-net time     */

/* Constants for Daylight Savings Time                  */                                  

#define DATE_DST_OFF    0       /* force DST to be off      */
#define DATE_DST_ON 1       /* force DST to be on       */
#define DATE_DST_AUTO   2       /* compute DST automatically    */

/* Days in months and month names used to format a date */

struct  dateinfo {
    uint32  dt_boot;        /* time when system booted  */
                    /*  add clktime to get the  */
                    /*  current time-of-day     */
    bool8   dt_bootvalid;       /* is dt_boot field valid?  */
    int32   dt_daylight;        /* whether to compute daylight  */
                    /*   savings time       */
    int32   dt_msize[12];       /* days per month       */
    char    *dt_mnam[12];       /* month names          */
    char    *dt_dnam[7];        /* day names            */
};

extern  struct  dateinfo Date;      /* Global date information  */

/* Constants for converting time to month/day/year/hour/minute/second   */

#define isleap(x)   ((x)%4==0)  /* leap year? (1970-2099)   */
#define SECPERDY    (60*60*24)  /* one day in seconds       */
#define SECPERHR    (60*60)     /* one hour in seconds      */
#define SECPERMN    (60)        /* one minute in seconds    */

/* The local time zone can be set to EST, CST, MST,or PST.      */

#define ZONE_EST    5       /* Eastern Standard time is 5   */
#define ZONE_CST    6       /*  hours west of England   */
#define ZONE_MST    7
#define ZONE_PST    8
#define TIMEZONE    ZONE_EST    /* timezone for this system */

/* In-line procedures to convert universal-to-local time and vice versa */

#define utim2ltim(x)    ((x)-TIMEZONE*SECPERHR)
#define ltim2utim(x)    ((x)+TIMEZONE*SECPERHR)

#define TIMERPORT   123     /* UDP port for time server */
#define TIMELPORT   53678       /* local UDP port for time  */

#ifndef TIMESERVER
#define TIMESERVER  "128.10.19.24"  /* IP address of NTP time server*/
#endif

#define TIMETIMEOUT 2000        /* timeout for time server (ms) */