The result of a AT+CCLK? is for example:
XX+CCLK: "21/08/18,06:39:40"    (note - not the correct date/time)

Approx every 50sec I call this routine to update the Hour and Minute
register.

The result of the above string is :
0x04 in the Hour register (should be 6dec or 0x06)
0x07 in the Minute register (should be 30+9=39dec or 0x27) for 06h39

I have attached the suspect code.

Where am I going wrong?

Francois

Registers
Hours        equ     0x38
Minutes     equ     0x39

D1    equ     0x40
D2    equ     0x41
D3    equ     0x42
etc.

GSM_TIME_UPDATE

Hours_Update
 movlw 0x30    ;Ascii value of zero
 subwf D20, w    ;register location for Hour-Tens
 movwf Temp    ;Hours Tens

 movlw .0       ;If Hour tens is zero then load Hour register with zero etc.
 subwf Temp, w
 btfsc STATUS, Z
 #movlf .0, Hours    ;(macro for literal to w and then w to f)

 movlw .1
 subwf Temp, w
 btfsc STATUS, Z
 #movlf .10, Hours

 movlw .2
 subwf Temp, w
 btfsc STATUS, Z
 #movlf .20, Hours

 movlw 0x30    ;convert ascii
 subwf D21, w    ;register location for Hour-Ones

 addwf Hours, f   ;Add Hour-Ones

Minute_Update
 movlw 0x30
 subwf D23, w
 movwf Temp    ;Minutes-Tens

 movlw .0
 subwf Temp, w
 btfsc STATUS, Z
 #movlf .0, Minutes

 movlw .1
 subwf Temp, w
 btfsc STATUS, Z
 #movlf .10, Minutes

 movlw .2
 subwf Temp, w
 btfsc STATUS, Z
 #movlf .20, Minutes

 movlw .3
 subwf Temp, w
 btfsc STATUS, Z
 #movlf .30, Minutes

 movlw .4
 subwf Temp, w
 btfsc STATUS, Z
 #movlf .40, Minutes

 movlw .5
 subwf Temp, w
 btfsc STATUS, Z
 #movlf .50, Minutes

 movlw 0x30
 subwf D24, w    ;register location for Minute-Ones

 addwf Minutes, f    ;Add Minute-Ones

 goto GSM_TIME_7

GSM_TIME_6    ;Time Not Updated
 bcf TimeFlag
 return

GSM_TIME_7    ;Time Updated
 bsf TimeFlag
 return

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