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Switch time "factor" code over to 0-based month indexing.

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This matches both struct tm and ReadTimeHex, so it avoids needing to increment the values.

Also, simplify the time() code a little bit.
This commit is contained in:
Stephen Heumann 2022-12-29 22:53:37 -06:00
parent 17faeda1de
commit b302a85fd6
1 changed files with 13 additions and 20 deletions
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33
time.asm
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@ -33,7 +33,7 @@ TimeCommon privdata
; For conversion to/from seconds since 13 Nov 1969
;
year ds 4 year 0..99
month ds 4 month 1..12
month ds 4 month 0..11
day ds 4 day 1..31
hour ds 4 hour 0..23
minute ds 4 minute 0..59
@ -269,19 +269,18 @@ lb0d stz second+2
;
; compute the # of days since 13 Nov 1969
;
lb0e mul4 year,#365,count count := 365*year + day + 31*(month-1)
lb0e mul4 year,#365,count count := 365*year + day + 31*month
add4 count,day
mul4 month,#31,t1
add4 count,t1
sub4 count,#31
add4 year,#32800,t2 t2 := year + 32800 (so it is positive)
lda month if January or February then
cmp #3
cmp #2
bge lb1
dec4 t2 year := year-1
bra lb2 else
lb1 mul4 month,#4,t1 count := count - (month*4+23) div 10
add4 t1,#23
lb1 mul4 month,#4,t1 count := count - (month*4+27) div 10
add4 t1,#27
div4 t1,#10
sub4 count,t1
lb2 div4 t2,#4,t1 count := count + (year+32800) div 4
@ -504,8 +503,8 @@ lb1 plb
lda #69 find the year
sta year
lda #1
sta month
sta day
stz month
stz hour
stz minute
stz second
@ -531,7 +530,6 @@ lb2a ble lb2
lda year set the year
sta tm_year
lda month set the month
dec A
sta tm_mon
sub4 t,count find the number of seconds
move4 t,t1
@ -605,7 +603,6 @@ temp2 equ 5 temp variable
dey
dey
lda [tmptr],Y
inc A
sta month
dey
dey
@ -631,8 +628,8 @@ temp2 equ 5 temp variable
brl lb1
lb0 move4 count,temp save the value for later return
lda #1 compute the days since the start of the
sta month year
sta day
sta day year
stz month
jsr factor
sub4 temp,count,count
div4 count,#60*60*24
@ -681,20 +678,16 @@ time start
and #$00FF
inc A
sta day
lda 5,S set the month
and #$FF00
xba
inc A
lda 6,S set the month
and #$00FF
sta month
lda 3,S set the year
and #$FF00
xba
lda 4,S set the year
and #$00FF
sta year
lda 3,S set the hour
and #$00FF
sta hour
lda 1,S set the minute
xba
lda 2,S set the minute
and #$00FF
sta minute
pla set the second