ClickHouse/src/IO/parseDateTimeBestEffort.h
flynn 5816858403
add parseDateTimeBestEffortUS function (#12028)
* add function parseDateTimeBestEffortUS
* add test
* add doc

Co-authored-by: alexey-milovidov <milovidov@yandex-team.ru>
2020-07-05 21:09:20 +03:00

65 lines
2.2 KiB
C++

#include <stddef.h>
#include <time.h>
#include <Core/Types.h>
class DateLUTImpl;
namespace DB
{
class ReadBuffer;
/** https://xkcd.com/1179/
*
* The existence of this function is an example of bad practice
* and contradicts our development principles.
*
* This function will recognize the following patterns:
*
* NNNNNNNNNN - 9..10 digits is a unix timestamp
*
* YYYYMMDDhhmmss - 14 numbers is always interpreted this way
*
* YYYYMMDD - 8 digits in a row
* YYYY*MM*DD - or with any delimiter after first 4-digit year component and after month.
*
* DD/MM/YY
* DD/MM/YYYY - when '/' separator is used, these are the only possible forms
* Note that American style is not supported.
*
* hh:mm:ss - when ':' separator is used, it is always time
* hh:mm - it can be specified without seconds
*
* YYYY - 4 digits is always year
*
* YYYYMM - 6 digits is a year, month if year was not already read
* hhmmss - 6 digits is a time if year was already read
*
* .nnnnnnn - any number of digits after point is fractional part of second, if it is not YYYY.MM.DD or DD.MM.YYYY
*
* T - means that time will follow
*
* Z - means zero UTC offset
*
* +hhmm
* +hh:mm
* +hh
* -... - time zone offset
*
* single whitespace can be used as a separator
*
* AM/PM - AM is ignored and PM means: add 12 hours if value is less than 12.
*
* Jan/Feb/Mar/Apr/May/Jun/Jul/Aug/Sep/Oct/Nov/Dec - allowed to specify month
* Mon/Tue/Wed/Thu/Fri/Sat/Sun - simply ignored.
*/
void parseDateTimeBestEffort(time_t & res, ReadBuffer & in, const DateLUTImpl & local_time_zone, const DateLUTImpl & utc_time_zone);
void parseDateTimeBestEffortUS(time_t & res, ReadBuffer & in, const DateLUTImpl & local_time_zone, const DateLUTImpl & utc_time_zone);
bool tryParseDateTimeBestEffort(time_t & res, ReadBuffer & in, const DateLUTImpl & local_time_zone, const DateLUTImpl & utc_time_zone);
void parseDateTime64BestEffort(DateTime64 & res, UInt32 scale, ReadBuffer & in, const DateLUTImpl & local_time_zone, const DateLUTImpl & utc_time_zone);
bool tryParseDateTime64BestEffort(DateTime64 & res, UInt32 scale, ReadBuffer & in, const DateLUTImpl & local_time_zone, const DateLUTImpl & utc_time_zone);
}