[COMMITTERS] pgsql: Add datetime macros for constants, for clarity: #define

[Bruce Momjian]

Log Message:
-----------
Add datetime macros for constants, for clarity:

#define SECS_PER_DAY  86400
#define USECS_PER_DAY INT64CONST(86400000000)
#define USECS_PER_HOUR    INT64CONST(3600000000)
#define USECS_PER_MINUTE INT64CONST(60000000)
#define USECS_PER_SEC INT64CONST(1000000)

Modified Files:
--------------
    pgsql/src/backend/utils/adt:
        date.c (r1.105 -> r1.106)
        
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/adt/date.c.diff?r1=1.105&r2=1.106)
        datetime.c (r1.141 -> r1.142)
        
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/adt/datetime.c.diff?r1=1.141&r2=1.142)
        nabstime.c (r1.128 -> r1.129)
        
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/adt/nabstime.c.diff?r1=1.128&r2=1.129)
        timestamp.c (r1.120 -> r1.121)
        
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/adt/timestamp.c.diff?r1=1.120&r2=1.121)
    pgsql/src/include/utils:
        timestamp.h (r1.40 -> r1.41)
        
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/include/utils/timestamp.h.diff?r1=1.40&r2=1.41)
    pgsql/src/interfaces/ecpg/pgtypeslib:
        dt_common.c (r1.20 -> r1.21)
        
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/interfaces/ecpg/pgtypeslib/dt_common.c.diff?r1=1.20&r2=1.21)
        interval.c (r1.13 -> r1.14)
        
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/interfaces/ecpg/pgtypeslib/interval.c.diff?r1=1.13&r2=1.14)
        timestamp.c (r1.23 -> r1.24)
        
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/interfaces/ecpg/pgtypeslib/timestamp.c.diff?r1=1.23&r2=1.24)

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