I will guess that you will need to convert to ASC||. Probably a better way but here is what I use.
Code:
READ_RTC:
    I2CREAD DS_SDA, DS_SCL, RTC, SEC_REG, [sec,mins,hr,day,date,mon,yr]
    
    SEC_T = sec & $70
    SEC_T = SEC_T>>4
    SEC_O = sec & $0F
    
    MIN_T = mins & $70
    MIN_T = MIN_T>>4
    MIN_O = MINs & $0F
    
    HR_T = hr & $70
    HR_T = HR_T>>4
    HR_O = hr & $0F
    
    MON_T = mon & $70
    MON_T = MON_T>>4
    MON_O = mon & $0F
    
    DATE_T = date & $70
    DATE_T = DATE_T>>4
    DATE_O = date & $0F
    
    YR_T = yr & $70
    YR_T = YR_T>>4
    YR_O = yr & $0F


    CRON[0] = " "
    CRON[1] = $30+HR_T
    CRON[2] = $30+HR_O
    CRON[3] = ":"
    CRON[4] = $30+MIN_T
    CRON[5] = $30+MIN_O
    CRON[6] = ":"
    CRON[7] = $30+SEC_T
    CRON[8] = $30+SEC_O
    CRON[9] = $d
    CRON[10] = $a


    CRON_D[0] = " "
    CRON_D[1] = $30+MON_T
    CRON_D[2] = $30+MON_O
    CRON_D[3] = "/"
    CRON_D[4] = $30+DATE_T
    CRON_D[5] = $30+DATE_O
    CRON_D[6] = "/"
    CRON_D[7] = $30+YR_T
    CRON_D[8] = $30+YR_O
    CRON_D[9] = $d
    CRON_D[10] = $a
    RETURN