~drizzle-trunk/drizzle/development

/* Copyright (C) 2000-2006 MySQL AB

   This program is free software; you can redistribute it and/or modify

   it under the terms of the GNU General Public License as published by

   the Free Software Foundation; version 2 of the License.

   This program is distributed in the hope that it will be useful,

   but WITHOUT ANY WARRANTY; without even the implied warranty of

   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License

   along with this program; if not, write to the Free Software

   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA */

/* Functions to handle date and time */

#include "mysql_priv.h"

#include <m_ctype.h>

	/* Some functions to calculate dates */

#ifndef TESTTIME

/*

  Name description of interval names used in statements.

  'interval_type_to_name' is ordered and sorted on interval size and

  interval complexity.

  Order of elements in 'interval_type_to_name' should correspond to 

  the order of elements in 'interval_type' enum

  See also interval_type, interval_names

*/

LEX_STRING interval_type_to_name[INTERVAL_LAST] = {

  { C_STRING_WITH_LEN("YEAR")},

  { C_STRING_WITH_LEN("QUARTER")},

  { C_STRING_WITH_LEN("MONTH")},

  { C_STRING_WITH_LEN("WEEK")},

  { C_STRING_WITH_LEN("DAY")},

  { C_STRING_WITH_LEN("HOUR")},

  { C_STRING_WITH_LEN("MINUTE")},

  { C_STRING_WITH_LEN("SECOND")},

  { C_STRING_WITH_LEN("MICROSECOND")},

  { C_STRING_WITH_LEN("YEAR_MONTH")},

  { C_STRING_WITH_LEN("DAY_HOUR")},

  { C_STRING_WITH_LEN("DAY_MINUTE")},

  { C_STRING_WITH_LEN("DAY_SECOND")},

  { C_STRING_WITH_LEN("HOUR_MINUTE")},

  { C_STRING_WITH_LEN("HOUR_SECOND")},

  { C_STRING_WITH_LEN("MINUTE_SECOND")},

  { C_STRING_WITH_LEN("DAY_MICROSECOND")},

  { C_STRING_WITH_LEN("HOUR_MICROSECOND")},

  { C_STRING_WITH_LEN("MINUTE_MICROSECOND")},

  { C_STRING_WITH_LEN("SECOND_MICROSECOND")}

}; 

	/* Calc weekday from daynr */

	/* Returns 0 for monday, 1 for tuesday .... */

int calc_weekday(long daynr,bool sunday_first_day_of_week)

{

  return ((int) ((daynr + 5L + (sunday_first_day_of_week ? 1L : 0L)) % 7));

}

/*

  The bits in week_format has the following meaning:

   WEEK_MONDAY_FIRST (0)  If not set	Sunday is first day of week

      		   	  If set	Monday is first day of week

   WEEK_YEAR (1)	  If not set	Week is in range 0-53

   	Week 0 is returned for the the last week of the previous year (for

	a date at start of january) In this case one can get 53 for the

	first week of next year.  This flag ensures that the week is

	relevant for the given year. Note that this flag is only

	releveant if WEEK_JANUARY is not set.

			  If set	 Week is in range 1-53.

	In this case one may get week 53 for a date in January (when

	the week is that last week of previous year) and week 1 for a

	date in December.

  WEEK_FIRST_WEEKDAY (2)  If not set	Weeks are numbered according

			   		to ISO 8601:1988

			  If set	The week that contains the first

					'first-day-of-week' is week 1.

	ISO 8601:1988 means that if the week containing January 1 has

	four or more days in the new year, then it is week 1;

	Otherwise it is the last week of the previous year, and the

	next week is week 1.

*/

uint calc_week(MYSQL_TIME *l_time, uint week_behaviour, uint *year)

{

  uint days;

  ulong daynr=calc_daynr(l_time->year,l_time->month,l_time->day);

  ulong first_daynr=calc_daynr(l_time->year,1,1);

  bool monday_first= test(week_behaviour & WEEK_MONDAY_FIRST);

  bool week_year= test(week_behaviour & WEEK_YEAR);

  bool first_weekday= test(week_behaviour & WEEK_FIRST_WEEKDAY);

  uint weekday=calc_weekday(first_daynr, !monday_first);

  *year=l_time->year;

  if (l_time->month == 1 && l_time->day <= 7-weekday)

  {

    if ((!week_year) && ((first_weekday && weekday != 0) || (!first_weekday && weekday >= 4)))

      return 0;

    week_year= 1;

    (*year)--;

    first_daynr-= (days=calc_days_in_year(*year));

    weekday= (weekday + 53*7- days) % 7;

  }

  if ((first_weekday && weekday != 0) ||

      (!first_weekday && weekday >= 4))

    days= daynr - (first_daynr+ (7-weekday));

  else

    days= daynr - (first_daynr - weekday);

  if (week_year && days >= 52*7)

  {

    weekday= (weekday + calc_days_in_year(*year)) % 7;

    if ((!first_weekday && weekday < 4) || (first_weekday && weekday == 0))

    {

      (*year)++;

      return 1;

    }

  }

  return days/7+1;

}

	/* Change a daynr to year, month and day */

	/* Daynr 0 is returned as date 00.00.00 */

void get_date_from_daynr(long daynr,uint *ret_year,uint *ret_month,

			 uint *ret_day)

{

  uint year,temp,leap_day,day_of_year,days_in_year;

  uchar *month_pos;

  if (daynr <= 365L || daynr >= 3652500)

  {						/* Fix if wrong daynr */

    *ret_year= *ret_month = *ret_day =0;

  }

  else

  {

    year= (uint) (daynr*100 / 36525L);

    temp=(((year-1)/100+1)*3)/4;

    day_of_year=(uint) (daynr - (long) year * 365L) - (year-1)/4 +temp;

    while (day_of_year > (days_in_year= calc_days_in_year(year)))

    {

      day_of_year-=days_in_year;

      (year)++;

    }

    leap_day=0;

    if (days_in_year == 366)

    {

      if (day_of_year > 31+28)

      {

	day_of_year--;

	if (day_of_year == 31+28)

	  leap_day=1;		/* Handle leapyears leapday */

      }

    }

    *ret_month=1;

    for (month_pos= days_in_month ;

	 day_of_year > (uint) *month_pos ;

	 day_of_year-= *(month_pos++), (*ret_month)++)

      ;

    *ret_year=year;

    *ret_day=day_of_year+leap_day;

  }

  return;

}

	/* Functions to handle periods */

ulong convert_period_to_month(ulong period)

{

  ulong a,b;

  if (period == 0)

    return 0L;

  if ((a=period/100) < YY_PART_YEAR)

    a+=2000;

  else if (a < 100)

    a+=1900;

  b=period%100;

  return a*12+b-1;

}

ulong convert_month_to_period(ulong month)

{

  ulong year;

  if (month == 0L)

    return 0L;

  if ((year=month/12) < 100)

  {

    year+=(year < YY_PART_YEAR) ? 2000 : 1900;

  }

  return year*100+month%12+1;

}

/*

  Convert a timestamp string to a MYSQL_TIME value and produce a warning 

  if string was truncated during conversion.

  NOTE

    See description of str_to_datetime() for more information.

*/

timestamp_type

str_to_datetime_with_warn(const char *str, uint length, MYSQL_TIME *l_time,

                          uint flags)

{

  int was_cut;

  THD *thd= current_thd;

  timestamp_type ts_type;

  ts_type= str_to_datetime(str, length, l_time,

                           (flags | (thd->variables.sql_mode &

                                     (MODE_INVALID_DATES |

                                      MODE_NO_ZERO_DATE))),

                           &was_cut);

  if (was_cut || ts_type <= MYSQL_TIMESTAMP_ERROR)

    make_truncated_value_warning(current_thd, MYSQL_ERROR::WARN_LEVEL_WARN,

                                 str, length, ts_type,  NullS);

  return ts_type;

}

/*

  Convert a datetime from broken-down MYSQL_TIME representation to corresponding 

  TIMESTAMP value.

  SYNOPSIS

    TIME_to_timestamp()

      thd             - current thread

      t               - datetime in broken-down representation, 

      in_dst_time_gap - pointer to bool which is set to true if t represents

                        value which doesn't exists (falls into the spring 

                        time-gap) or to false otherwise.

  RETURN

     Number seconds in UTC since start of Unix Epoch corresponding to t.

     0 - t contains datetime value which is out of TIMESTAMP range.

*/

my_time_t TIME_to_timestamp(THD *thd, const MYSQL_TIME *t, bool *in_dst_time_gap)

{

  my_time_t timestamp;

  *in_dst_time_gap= 0;

  thd->time_zone_used= 1;

  timestamp= thd->variables.time_zone->TIME_to_gmt_sec(t, in_dst_time_gap);

  if (timestamp)

  {

    return timestamp;

  }

  /* If we are here we have range error. */

  return(0);

}

/*

  Convert a time string to a MYSQL_TIME struct and produce a warning

  if string was cut during conversion.

  NOTE

    See str_to_time() for more info.

*/

bool

str_to_time_with_warn(const char *str, uint length, MYSQL_TIME *l_time)

{

  int warning;

  bool ret_val= str_to_time(str, length, l_time, &warning);

  if (ret_val || warning)

    make_truncated_value_warning(current_thd, MYSQL_ERROR::WARN_LEVEL_WARN,

                                 str, length, MYSQL_TIMESTAMP_TIME, NullS);

  return ret_val;

}

/*

  Convert a system time structure to TIME

*/

void localtime_to_TIME(MYSQL_TIME *to, struct tm *from)

{

  to->neg=0;

  to->second_part=0;

  to->year=	(int) ((from->tm_year+1900) % 10000);

  to->month=	(int) from->tm_mon+1;

  to->day=	(int) from->tm_mday;

  to->hour=	(int) from->tm_hour;

  to->minute=	(int) from->tm_min;

  to->second=   (int) from->tm_sec;

}

void calc_time_from_sec(MYSQL_TIME *to, long seconds, long microseconds)

{

  long t_seconds;

  // to->neg is not cleared, it may already be set to a useful value

  to->time_type= MYSQL_TIMESTAMP_TIME;

  to->year= 0;

  to->month= 0;

  to->day= 0;

  to->hour= seconds/3600L;

  t_seconds= seconds%3600L;

  to->minute= t_seconds/60L;

  to->second= t_seconds%60L;

  to->second_part= microseconds;

}

/*

  Parse a format string specification

  SYNOPSIS

    parse_date_time_format()

    format_type		Format of string (time, date or datetime)

    format_str		String to parse

    format_length	Length of string

    date_time_format	Format to fill in

  NOTES

    Fills in date_time_format->positions for all date time parts.

    positions marks the position for a datetime element in the format string.

    The position array elements are in the following order:

    YYYY-DD-MM HH-MM-DD.FFFFFF AM

    0    1  2  3  4  5  6      7

    If positions[0]= 5, it means that year will be the forth element to

    read from the parsed date string.

  RETURN

    0	ok

    1	error

*/

bool parse_date_time_format(timestamp_type format_type, 

			    const char *format, uint format_length,

			    DATE_TIME_FORMAT *date_time_format)

{

  uint offset= 0, separators= 0;

  const char *ptr= format, *format_str;

  const char *end= ptr+format_length;

  uchar *dt_pos= date_time_format->positions;

  /* need_p is set if we are using AM/PM format */

  bool need_p= 0, allow_separator= 0;

  ulong part_map= 0, separator_map= 0;

  const char *parts[16];

  date_time_format->time_separator= 0;

  date_time_format->flag= 0;			// For future

  /*

    Fill position with 'dummy' arguments to found out if a format tag is

    used twice (This limit's the format to 255 characters, but this is ok)

  */

  dt_pos[0]= dt_pos[1]= dt_pos[2]= dt_pos[3]=

    dt_pos[4]= dt_pos[5]= dt_pos[6]= dt_pos[7]= 255;

  for (; ptr != end; ptr++)

  {

    if (*ptr == '%' && ptr+1 != end)

    {

      uint position;

      switch (*++ptr) {

      case 'y':					// Year

      case 'Y':

	position= 0;

	break;

      case 'c':					// Month

      case 'm':

	position= 1;

	break;

      case 'd':

      case 'e':

	position= 2;

	break;

      case 'h':

      case 'I':

      case 'l':

	need_p= 1;				// Need AM/PM

	/* Fall through */

      case 'k':

      case 'H':

	position= 3;

	break;

      case 'i':

	position= 4;

	break;

      case 's':

      case 'S':

	position= 5;

	break;

      case 'f':

	position= 6;

	if (dt_pos[5] != offset-1 || ptr[-2] != '.')

	  return 1;				// Wrong usage of %f

	break;

      case 'p':					// AM/PM

	if (offset == 0)			// Can't be first

	  return 0;

	position= 7;

	break;

      default:

	return 1;				// Unknown controll char

      }

      if (dt_pos[position] != 255)		// Don't allow same tag twice

	return 1;

      parts[position]= ptr-1;

      /*

	If switching from time to date, ensure that all time parts

	are used

      */

      if (part_map && position <= 2 && !(part_map & (1 | 2 | 4)))

	offset=5;

      part_map|= (ulong) 1 << position;

      dt_pos[position]= offset++;

      allow_separator= 1;

    }

    else

    {

      /*

	Don't allow any characters in format as this could easily confuse

	the date reader

      */

      if (!allow_separator)

	return 1;				// No separator here

      allow_separator= 0;			// Don't allow two separators

      separators++;

      /* Store in separator_map which parts are punct characters */

      if (my_ispunct(&my_charset_latin1, *ptr))

	separator_map|= (ulong) 1 << (offset-1);

      else if (!my_isspace(&my_charset_latin1, *ptr))

	return 1;

    }

  }

  /* If no %f, specify it after seconds.  Move %p up, if necessary */

  if ((part_map & 32) && !(part_map & 64))

  {

    dt_pos[6]= dt_pos[5] +1;

    parts[6]= parts[5];				// For later test in (need_p)

    if (dt_pos[6] == dt_pos[7])			// Move %p one step up if used

      dt_pos[7]++;

  }

  /*

    Check that we have not used a non legal format specifier and that all

    format specifiers have been used

    The last test is to ensure that %p is used if and only if

    it's needed.

  */

  if ((format_type == MYSQL_TIMESTAMP_DATETIME &&

       !test_all_bits(part_map, (1 | 2 | 4 | 8 | 16 | 32))) ||

      (format_type == MYSQL_TIMESTAMP_DATE && part_map != (1 | 2 | 4)) ||

      (format_type == MYSQL_TIMESTAMP_TIME &&

       !test_all_bits(part_map, 8 | 16 | 32)) ||

      !allow_separator ||			// %option should be last

      (need_p && dt_pos[6] +1 != dt_pos[7]) ||

      (need_p ^ (dt_pos[7] != 255)))

    return 1;

  if (dt_pos[6] != 255)				// If fractional seconds

  {

    /* remove fractional seconds from later tests */

    uint pos= dt_pos[6] -1;

    /* Remove separator before %f from sep map */

    separator_map= ((separator_map & ((ulong) (1 << pos)-1)) |

		    ((separator_map & ~((ulong) (1 << pos)-1)) >> 1));

    if (part_map & 64)			      

    {

      separators--;				// There is always a separator

      need_p= 1;				// force use of separators

    }

  }

  /*

    Remove possible separator before %p from sep_map

    (This can either be at position 3, 4, 6 or 7) h.m.d.%f %p

  */

  if (dt_pos[7] != 255)

  {

    if (need_p && parts[7] != parts[6]+2)

      separators--;

  }     

  /*

    Calculate if %p is in first or last part of the datetime field

    At this point we have either %H-%i-%s %p 'year parts' or

    'year parts' &H-%i-%s %p" as %f was removed above

  */

  offset= dt_pos[6] <= 3 ? 3 : 6;

  /* Remove separator before %p from sep map */

  separator_map= ((separator_map & ((ulong) (1 << offset)-1)) |

		  ((separator_map & ~((ulong) (1 << offset)-1)) >> 1));

  format_str= 0;

  switch (format_type) {

  case MYSQL_TIMESTAMP_DATE:

    format_str= known_date_time_formats[INTERNAL_FORMAT].date_format;

    /* fall through */

  case MYSQL_TIMESTAMP_TIME:

    if (!format_str)

      format_str=known_date_time_formats[INTERNAL_FORMAT].time_format;

    /*

      If there is no separators, allow the internal format as we can read

      this.  If separators are used, they must be between each part

    */

    if (format_length == 6 && !need_p &&

	!my_strnncoll(&my_charset_bin,

		      (const uchar *) format, 6, 

		      (const uchar *) format_str, 6))

      return 0;

    if (separator_map == (1 | 2))

    {

      if (format_type == MYSQL_TIMESTAMP_TIME)

      {

	if (*(format+2) != *(format+5))

	  break;				// Error

	/* Store the character used for time formats */

	date_time_format->time_separator= *(format+2);

      }

      return 0;

    }

    break;

  case MYSQL_TIMESTAMP_DATETIME:

    /*

      If there is no separators, allow the internal format as we can read

      this.  If separators are used, they must be between each part.

      Between DATE and TIME we also allow space as separator

    */

    if ((format_length == 12 && !need_p &&

	 !my_strnncoll(&my_charset_bin, 

		       (const uchar *) format, 12,

		       (const uchar*) known_date_time_formats[INTERNAL_FORMAT].datetime_format,

		       12)) ||

	(separators == 5 && separator_map == (1 | 2 | 8 | 16)))

      return 0;

    break;

  default:

    assert(1);

    break;

  }

  return 1;					// Error

}

/*

  Create a DATE_TIME_FORMAT object from a format string specification

  SYNOPSIS

    date_time_format_make()

    format_type		Format to parse (time, date or datetime)

    format_str		String to parse

    format_length	Length of string

  NOTES

    The returned object should be freed with my_free()

  RETURN

    NULL ponter:	Error

    new object

*/

DATE_TIME_FORMAT

*date_time_format_make(timestamp_type format_type,

		       const char *format_str, uint format_length)

{

  DATE_TIME_FORMAT tmp;

  if (format_length && format_length < 255 &&

      !parse_date_time_format(format_type, format_str,

			      format_length, &tmp))

  {

    tmp.format.str=    (char*) format_str;

    tmp.format.length= format_length;

    return date_time_format_copy((THD *)0, &tmp);

  }

  return 0;

}

/*

  Create a copy of a DATE_TIME_FORMAT object

  SYNOPSIS

    date_and_time_format_copy()

    thd			Set if variable should be allocated in thread mem

    format		format to copy

  NOTES

    The returned object should be freed with my_free()

  RETURN

    NULL ponter:	Error

    new object

*/

DATE_TIME_FORMAT *date_time_format_copy(THD *thd, DATE_TIME_FORMAT *format)

{

  DATE_TIME_FORMAT *new_format;

  ulong length= sizeof(*format) + format->format.length + 1;

  if (thd)

    new_format= (DATE_TIME_FORMAT *) thd->alloc(length);

  else

    new_format=  (DATE_TIME_FORMAT *) my_malloc(length, MYF(MY_WME));

  if (new_format)

  {

    /* Put format string after current pos */

    new_format->format.str= (char*) (new_format+1);

    memcpy((char*) new_format->positions, (char*) format->positions,

	   sizeof(format->positions));

    new_format->time_separator= format->time_separator;

    /* We make the string null terminated for easy printf in SHOW VARIABLES */

    memcpy((char*) new_format->format.str, format->format.str,

	   format->format.length);

    new_format->format.str[format->format.length]= 0;

    new_format->format.length= format->format.length;

  }

  return new_format;

}

KNOWN_DATE_TIME_FORMAT known_date_time_formats[6]=

{

  {"USA", "%m.%d.%Y", "%Y-%m-%d %H.%i.%s", "%h:%i:%s %p" },

  {"JIS", "%Y-%m-%d", "%Y-%m-%d %H:%i:%s", "%H:%i:%s" },

  {"ISO", "%Y-%m-%d", "%Y-%m-%d %H:%i:%s", "%H:%i:%s" },

  {"EUR", "%d.%m.%Y", "%Y-%m-%d %H.%i.%s", "%H.%i.%s" },

  {"INTERNAL", "%Y%m%d",   "%Y%m%d%H%i%s", "%H%i%s" },

  { 0, 0, 0, 0 }

};

/*

   Return format string according format name.

   If name is unknown, result is NULL

*/

const char *get_date_time_format_str(KNOWN_DATE_TIME_FORMAT *format,

				     timestamp_type type)

{

  switch (type) {

  case MYSQL_TIMESTAMP_DATE:

    return format->date_format;

  case MYSQL_TIMESTAMP_DATETIME:

    return format->datetime_format;

  case MYSQL_TIMESTAMP_TIME:

    return format->time_format;

  default:

    assert(0);				// Impossible

    return 0;

  }

}

/****************************************************************************

  Functions to create default time/date/datetime strings

  NOTE:

    For the moment the DATE_TIME_FORMAT argument is ignored becasue

    MySQL doesn't support comparing of date/time/datetime strings that

    are not in arbutary order as dates are compared as strings in some

    context)

    This functions don't check that given MYSQL_TIME structure members are

    in valid range. If they are not, return value won't reflect any 

    valid date either. Additionally, make_time doesn't take into

    account time->day member: it's assumed that days have been converted

    to hours already.

****************************************************************************/

void make_time(const DATE_TIME_FORMAT *format __attribute__((unused)),

               const MYSQL_TIME *l_time, String *str)

{

  uint length= (uint) my_time_to_str(l_time, (char*) str->ptr());

  str->length(length);

  str->set_charset(&my_charset_bin);

}

void make_date(const DATE_TIME_FORMAT *format __attribute__((unused)),

               const MYSQL_TIME *l_time, String *str)

{

  uint length= (uint) my_date_to_str(l_time, (char*) str->ptr());

  str->length(length);

  str->set_charset(&my_charset_bin);

}

void make_datetime(const DATE_TIME_FORMAT *format __attribute__((unused)),

                   const MYSQL_TIME *l_time, String *str)

{

  uint length= (uint) my_datetime_to_str(l_time, (char*) str->ptr());

  str->length(length);

  str->set_charset(&my_charset_bin);

}

void make_truncated_value_warning(THD *thd, MYSQL_ERROR::enum_warning_level level,

                                  const char *str_val,

				  uint str_length, timestamp_type time_type,

                                  const char *field_name)

{

  char warn_buff[MYSQL_ERRMSG_SIZE];

  const char *type_str;

  CHARSET_INFO *cs= &my_charset_latin1;

  char buff[128];

  String str(buff,(uint32) sizeof(buff), system_charset_info);

  str.copy(str_val, str_length, system_charset_info);

  str[str_length]= 0;               // Ensure we have end 0 for snprintf

  switch (time_type) {

    case MYSQL_TIMESTAMP_DATE: 

      type_str= "date";

      break;

    case MYSQL_TIMESTAMP_TIME:

      type_str= "time";

      break;

    case MYSQL_TIMESTAMP_DATETIME:  // FALLTHROUGH

    default:

      type_str= "datetime";

      break;

  }

  if (field_name)

    cs->cset->snprintf(cs, warn_buff, sizeof(warn_buff),

                       ER(ER_TRUNCATED_WRONG_VALUE_FOR_FIELD),

                       type_str, str.c_ptr(), field_name,

                       (ulong) thd->row_count);

  else

  {

    if (time_type > MYSQL_TIMESTAMP_ERROR)

      cs->cset->snprintf(cs, warn_buff, sizeof(warn_buff),

                         ER(ER_TRUNCATED_WRONG_VALUE),

                         type_str, str.c_ptr());

    else

      cs->cset->snprintf(cs, warn_buff, sizeof(warn_buff),

                         ER(ER_WRONG_VALUE), type_str, str.c_ptr());

  }

  push_warning(thd, level,

               ER_TRUNCATED_WRONG_VALUE, warn_buff);

}

/* Daynumber from year 0 to 9999-12-31 */

#define MAX_DAY_NUMBER 3652424L

bool date_add_interval(MYSQL_TIME *ltime, interval_type int_type, INTERVAL interval)

{

  long period, sign;

  ltime->neg= 0;

  sign= (interval.neg ? -1 : 1);

  switch (int_type) {

  case INTERVAL_SECOND:

  case INTERVAL_SECOND_MICROSECOND:

  case INTERVAL_MICROSECOND:

  case INTERVAL_MINUTE:

  case INTERVAL_HOUR:

  case INTERVAL_MINUTE_MICROSECOND:

  case INTERVAL_MINUTE_SECOND:

  case INTERVAL_HOUR_MICROSECOND:

  case INTERVAL_HOUR_SECOND:

  case INTERVAL_HOUR_MINUTE:

  case INTERVAL_DAY_MICROSECOND:

  case INTERVAL_DAY_SECOND:

  case INTERVAL_DAY_MINUTE:

  case INTERVAL_DAY_HOUR:

  {

    int64_t sec, days, daynr, microseconds, extra_sec;

    ltime->time_type= MYSQL_TIMESTAMP_DATETIME; // Return full date

    microseconds= ltime->second_part + sign*interval.second_part;

    extra_sec= microseconds/1000000L;

    microseconds= microseconds%1000000L;

    sec=((ltime->day-1)*3600*24L+ltime->hour*3600+ltime->minute*60+