C语言字符串转换成日期

2019-04-14 08:38发布

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  /***************************************************************************** * 版权所有(C) 2006, ZTE Corp. WiMAX *---------------------------------------------------------------------------- * 模 块 名 : BSPCommon * 文件名称 : str2time.c * 文件标识 : {[N/A]} * 内容摘要 : 将字符串转换为时间 * 注意事项 : * 作 者 : 田瑞忠 * 创建日期 : 2008-12-27 * 当前版本 : Ver1.0 *---------------------------------------------------------------------------- * 变更记录 : * * $记录1 * 变 更 单: $0000000(N/A) * 责 任 人: 田瑞忠 * 修改日戳: 2008-12-27 10:54:17 * 变更说明: 创建文件 * *---------------------------------------------------------------------------- */ /* 本文件需要引入的外部定义只有 struct tm 这个结构, 它的定义如下: * struct tm * { * int tm_sec; // seconds after the minute - [0, 59] * int tm_min; // minutes after the hour - [0, 59] * int tm_hour; // hours after midnight - [0, 23] * int tm_mday; // day of the month - [1, 31] * int tm_mon; // months since January - [0, 11] * int tm_year; // years since 1900 * int tm_wday; // days since Sunday - [0, 6] * int tm_yday; // days since January 1 - [0, 365] * int tm_isdst; // Daylight Saving Time flag * }; * * 在上面这个结构中, 只有年月日时分秒6个必要的元素, 其它的数字可以计算得到. * 因为结构定义年从1900年开始, 而转换后的统一秒数只能达到136年, 所以目前能够识别 * 的年限范围是在1900~2036年之间. * 本文件提供的字符串转日期目前只支持常见的中英文格式, 比如年月日, 时分秒, * 通常人能够直观读出的日期读数, 本文应该都可以识别, 比如: * sep 3, 1995, 20:30 -> 1995-09-03 20:30:00 * 3sep97 -> 1997-09-03 00:00:00 * oct 4,03 -> 2003-10-04 00:00:00 * mon dec 29, 2008 -> 2008-12-29 00:00:00 * 2011 nov 11, 11:11:11 -> 2011-11-11 11:11:11 * 10:00am, 2008/9/1 -> 2008-09-01 10:00:00 * 10/01/1976 3:01:05pm -> 1976-10-01 15:01:05 * 但产生歧议的日期, 比如 01/02/03, 本文将按照月份优先, 日期其次, * 最后是年份的格式将被解读成 2003年1月2日. * * 本文亦可识别一连串的数字组成的日期格式, 但月日时分秒必须使用两位十进制数表示. * * 若您还有其它不明事项, 可以运行strtotimeTest()函数进行检查. 在移植到PC机运行时 * 只要改名为main()函数即可编译运行(请包含stdio.h头文件). 作者@2008-12-29 * */ #include #define TOKEN_INIT 0 #define TOKEN_VAL 1 #define TOKEN_SEC 2 #define TOKEN_MIN 3 #define TOKEN_HOUR 4 #define TOKEN_HALFDAY 5 #define TOKEN_DAY 6 #define TOKEN_MONTH 7 #define TOKEN_YEAR 8 #define TOKEN_WEEKDAY 9 #define STEP_INIT 0 #define STEP_DATE 1 #define STEP_TIME 2 #define STEP_OVER 3 #define FLAG_SEC 0x0001 #define FLAG_MIN 0x0002 #define FLAG_HOUR 0x0004 #define FLAG_HALFDAY 0x0008 #define FLAG_DAY 0x0010 #define FLAG_MONTH 0x0020 #define FLAG_YEAR 0x0040 #define FLAG_TIME 0x0100 #define FLAG_DATE 0x0200 #define FLAG_ALPHA 0x1000 static char s_cWeekDay[] = "MonTueWedThuFriSatSun"; static char s_cWeekDayU[] = "MONTUEWEDTHUFRISATSUN"; static char s_cWeekDayL[] = "montuewedthufrisatsun"; static char s_cMonth[] = "JanFebMarAprMayJunJulAugSepOctNovDec"; static char s_cMonthU[] = "JANFEBMARAPRMAYJUNJULAUTSEPOCTNOVDEC"; static char s_cMonthL[] = "janfebmaraprmayjunjulaugsepoctnovdec"; static int s_iMonthFix[] = {2, 0, 2, 1, 2, 1, 2, 2, 1, 2, 1, 2}; #define IsTimeDelim(a) ((a) == ':') #define IsDateDelim(a) (isspace(a) || (a) == ',' || (a) == '.' || (a) == '-' || (a) == '/' || (a) == '\') #define LeapYear(year) (((year) % 400 == 0) || (((year) % 100 != 0) && ((year) % 4 == 0))) /***************************************************************************** * 函数名称 : nextTimeToken(*) * 功能描述 : 找到下一个时间标记 * 读全局变量 : 无 * 写全局变量 : 无 * 输入参数 : timeStr - 时间日期字符串 * 输出参数 : pVal - 标记可以转换的年月日及时间的读数值 pFlag - 类型标记, 标明解析的是数字, 还是有量纲的值 * 返 回 值 : 解析过的字符长度, 失败时返回0 * 其它说明 : 内部函数, 要求入参指针必须非空 *--------------------------------------------------------------------------- * 历史记录(变更单, 责任人@修改日期, 操作说明) * $0000000(N/A), 田瑞忠@2008-12-27 16:14:59 创建 *---------------------------------------------------------------------------- */ static int nextTimeToken(char *timeStr, int *pVal, int *pFlag) { char *pChar = timeStr, *pCharEnd; int iFlags = 0, iTemp; *pFlag = TOKEN_INIT; /* 跳过分隔符 */ while (IsTimeDelim(*pChar) || IsDateDelim(*pChar)) { pChar++; } /* 是数值串, 直接返回数值 */ if (isdigit(*pChar)) { for (*pVal = 0, pCharEnd = pChar; isdigit(*pCharEnd); pCharEnd++) { *pVal = *pVal * 10 + (*pCharEnd - '0'); } /* 英文字母序号, 被指定为day */ if (*(pCharEnd - 1) == '1' && strncmp(pCharEnd, "st", 2) == 0) { *pFlag = TOKEN_DAY, pCharEnd += 2; } else if (*(pCharEnd - 1) == '2' && strncmp(pCharEnd, "nd", 2) == 0) { *pFlag = TOKEN_DAY, pCharEnd += 2; } else if (*(pCharEnd - 1) == '3' && strncmp(pCharEnd, "rd", 2) == 0) { *pFlag = TOKEN_DAY, pCharEnd += 2; } else if (strncmp(pCharEnd, "th", 2) == 0) { *pFlag = TOKEN_DAY, pCharEnd += 2; } if (*pFlag == TOKEN_DAY) { return pCharEnd - timeStr; } #if 1 /* 为中文服务, 可忽略 */ /* 跳过空格, 以检查单位识别符 */ while (isspace(*pChar)) { pChar++; } /* 汉字量纲, 被特许为可识别的日期标识 */ if (strncmp(pCharEnd, "年", 2) == 0) { *pFlag = TOKEN_YEAR, pCharEnd += 2; } else if (strncmp(pCharEnd, "月", 2) == 0) { *pFlag = TOKEN_MONTH, pCharEnd += 2; } else if (strncmp(pCharEnd, "日", 2) == 0) { *pFlag = TOKEN_DAY, pCharEnd += 2; } else if (strncmp(pCharEnd, "时", 2) == 0) { *pFlag = TOKEN_HOUR, pCharEnd += 2; } else if (strncmp(pCharEnd, "分", 2) == 0) { *pFlag = TOKEN_MIN, pCharEnd += 2; } else if (strncmp(pCharEnd, "秒", 2) == 0) { *pFlag = TOKEN_SEC, pCharEnd += 2; } else #endif { *pFlag= TOKEN_VAL; } return pCharEnd - timeStr; } /* (isdigit(*pChar)) */ /* 不是数值且不是字母(其它标点, 不可显示字符), 一般不被支持, 返回0 */ if (!isalpha(*pChar)) { if (*pChar >= 0) { return 0; } /* 非ASCII字符集, 比如是中文"星期一"之类, 跳过 */ pCharEnd = pChar; while (*pCharEnd != ' ' && *pCharEnd != ',' && *pCharEnd != EOS) { pCharEnd++; } return pCharEnd - timeStr; } /* (!isdigit(*pChar) && !isalpha(*pChar)) */ /* 是字母, 检查是不是月份 */ for (iTemp = 0; iTemp < 12; iTemp++) { if (strncmp(pChar, s_cMonth + iTemp * 3, 3) == 0) { *pVal = iTemp + 1; break; } else if (strncmp(pChar, s_cMonthL + iTemp * 3, 3) == 0) { *pVal = iTemp + 1; break; } else if (strncmp(pChar, s_cMonthU + iTemp * 3, 3) == 0) { *pVal = iTemp + 1; break; } } /* 月份字母检查 */ /* 找到月份字母, 跳过尾部字母 */ if (iTemp < 12) { pCharEnd = pChar + 3; while (isalpha(*pCharEnd)) { pCharEnd++; } *pFlag = TOKEN_MONTH; return pCharEnd - timeStr; } /* 未找到月份字母, 则检查星期字母 */ for (iTemp = 0; iTemp < 7; iTemp++) { if (strncmp(pChar, s_cWeekDay + iTemp * 3, 3) == 0) { *pVal = iTemp; break; } else if (strncmp(pChar, s_cWeekDayL + iTemp * 3, 3) == 0) { *pVal = iTemp; break; } else if (strncmp(pChar, s_cWeekDayU + iTemp * 3, 3) == 0) { *pVal = iTemp; break; } } /* 星期字母检查 */ /* 找到星期字母 */ if (iTemp < 7) { pCharEnd = pChar + 3; while (isalpha(*pCharEnd)) { pCharEnd++; } *pFlag = TOKEN_WEEKDAY; return pCharEnd - timeStr; } /* 午前午后标志检查 */ if (strncmp(pChar, "am", 2) == 0 || strncmp(pChar, "AM", 2) == 0) { pCharEnd = pChar + 2; if (!isalpha(*pCharEnd)) { *pFlag = TOKEN_HALFDAY; *pVal = 0; return pCharEnd - timeStr; } } if (strncmp(pChar, "pm", 2) == 0 || strncmp(pChar, "PM", 2) == 0) { pCharEnd = pChar + 2; if (!isalpha(*pCharEnd)) { *pFlag = TOKEN_HALFDAY; *pVal = 1; return pCharEnd - timeStr; } } return 0; } /* nextTimeToken() */ /***************************************************************************** * 函数名称 : digit2time(*) * 功能描述 : 将日期数字转换为时间结构, 必须按年月日时分秒排列, 否则看不懂 * 读全局变量 : 无 * 写全局变量 : 无 * 输入参数 : timeStr - 时间日期字符串 iLen - 时间日期字符串长度 * 输出参数 : ptTime - 日期时间结构 * 返 回 值 : 年月日时分秒有效的标志 * 其它说明 : 歧义和冲突处理, 按排列的优先顺序进行 *--------------------------------------------------------------------------- * 历史记录(变更单, 责任人@修改日期, 操作说明) * $0000000(N/A), 田瑞忠@2008-12-28 10:47:31 创建 *---------------------------------------------------------------------------- */ static int digit2time(char *timeStr, int iLen, struct tm *ptTime) { char *pChar = timeStr; memset(ptTime, 0, sizeof(*ptTime)); if (iLen < 6 || iLen % 2 != 0) { return 0; } /* 允许的日期时间格式(按常用频度排列): 5 + 4 + 3 + 2 + 1 = 15 纪年月日时分秒 - YYYYMMDDHHmmss 年月日时分秒 - YYMMDDHHmmss 纪年月日时分 - YYYYMMDDHHmm 月日时分秒 - MMDDHHmmss 年月日时分 - YYMMDDHHmm 纪年月日时 - YYYYMMDDHH 月日时分 - MMDDHHmm 纪年月日 - YYYYMMDD 日时分秒 - DDHHmmss 年月日时 - YYMMDDHH 年月日 - YYMMDD 纪年月 - YYYYMM 时分秒 - HHmmss 日时分 - DDHHmm 月日时 - MMDDHH */ /* 超长格式, 只有: YYYYMMDDHHmmss */ if (iLen >= 14) { ptTime->tm_year = (pChar[0] - '0') * 1000 + (pChar[1] - '0') * 100 + (pChar[2] - '0') * 10 + (pChar[3] - '0'); ptTime->tm_mon = (pChar[4] - '0') * 10 + (pChar[5] - '0'); ptTime->tm_mday = (pChar[6] - '0') * 10 + (pChar[7] - '0'); ptTime->tm_hour = (pChar[8] - '0') * 10 + (pChar[9] - '0'); ptTime->tm_min = (pChar[10] - '0') * 10 + (pChar[11] - '0'); ptTime->tm_sec = (pChar[12] - '0') * 10 + (pChar[13] - '0'); if (ptTime->tm_year >= 1900 && ptTime->tm_year < 2036 && ptTime->tm_mon < 13 && ptTime->tm_mday <= 29 + s_iMonthFix[ptTime->tm_mon - 1] && ptTime->tm_hour < 24 && ptTime->tm_min < 60 && ptTime->tm_sec < 60) { return FLAG_SEC | FLAG_MIN | FLAG_HOUR | FLAG_DAY | FLAG_MONTH | FLAG_YEAR; } } /* 次长格式, 有: YYYYMMDDHHmm, YYMMDDHHmmss */ else if (iLen == 12) { /* YYYYMMDDHHmm */ ptTime->tm_year = (pChar[0] - '0') * 1000 + (pChar[1] - '0') * 100 + (pChar[2] - '0') * 10 + (pChar[3] - '0'); ptTime->tm_mon = (pChar[4] - '0') * 10 + (pChar[5] - '0'); ptTime->tm_mday = (pChar[6] - '0') * 10 + (pChar[7] - '0'); ptTime->tm_hour = (pChar[8] - '0') * 10 + (pChar[9] - '0'); ptTime->tm_min = (pChar[10] - '0') * 10 + (pChar[11] - '0'); if (ptTime->tm_year >= 1900 && ptTime->tm_year < 2036 && ptTime->tm_mon < 13 && ptTime->tm_mday <= 29 + s_iMonthFix[ptTime->tm_mon - 1] && ptTime->tm_hour < 24 && ptTime->tm_min < 60) { return FLAG_MIN | FLAG_HOUR | FLAG_DAY | FLAG_MONTH | FLAG_YEAR; } /* YYMMDDHHmmss */ ptTime->tm_year = (pChar[0] - '0') * 10 + (pChar[1] - '0'); ptTime->tm_year+= (ptTime->tm_year >= 70) ? 1900 : 2000; ptTime->tm_mon = (pChar[2] - '0') * 10 + (pChar[3] - '0'); ptTime->tm_mday = (pChar[4] - '0') * 10 + (pChar[5] - '0'); ptTime->tm_hour = (pChar[6] - '0') * 10 + (pChar[7] - '0'); ptTime->tm_min = (pChar[8] - '0') * 10 + (pChar[9] - '0'); ptTime->tm_sec = (pChar[10] - '0') * 10 + (pChar[11] - '0'); if (ptTime->tm_year >= 1900 && ptTime->tm_year < 2036 && ptTime->tm_mon < 13 && ptTime->tm_mday <= 29 + s_iMonthFix[ptTime->tm_mon - 1] && ptTime->tm_hour < 24 && ptTime->tm_min < 60 && ptTime->tm_sec < 60) { return FLAG_SEC | FLAG_MIN | FLAG_HOUR | FLAG_DAY | FLAG_MONTH | FLAG_YEAR; } } /* (iLen == 12) */ /* 10字节, 有: MMDDHHmmss, YYMMDDHHmm, YYYYMMDDHH */ else if (iLen == 10) { /* MMDDHHmmss */ ptTime->tm_mon = (pChar[0] - '0') * 10 + (pChar[1] - '0'); ptTime->tm_mday = (pChar[2] - '0') * 10 + (pChar[3] - '0'); ptTime->tm_hour = (pChar[4] - '0') * 10 + (pChar[5] - '0'); ptTime->tm_min = (pChar[6] - '0') * 10 + (pChar[7] - '0'); ptTime->tm_sec = (pChar[8] - '0') * 10 + (pChar[9] - '0'); if (ptTime->tm_mon < 13 && ptTime->tm_mday <= 29 + s_iMonthFix[ptTime->tm_mon - 1] && ptTime->tm_hour < 24 && ptTime->tm_min < 60 && ptTime->tm_sec < 60) { return FLAG_SEC | FLAG_MIN | FLAG_HOUR | FLAG_DAY | FLAG_MONTH; } /* YYMMDDHHmm */ ptTime->tm_year = (pChar[0] - '0') * 10 + (pChar[1] - '0'); ptTime->tm_year+= (ptTime->tm_year >= 70) ? 1900 : 2000; ptTime->tm_mon = (pChar[2] - '0') * 10 + (pChar[3] - '0'); ptTime->tm_mday = (pChar[4] - '0') * 10 + (pChar[5] - '0'); ptTime->tm_hour = (pChar[6] - '0') * 10 + (pChar[7] - '0'); ptTime->tm_min = (pChar[8] - '0') * 10 + (pChar[9] - '0'); if (ptTime->tm_year >= 1900 && ptTime->tm_year < 2036 && ptTime->tm_mon < 13 && ptTime->tm_mday <= 29 + s_iMonthFix[ptTime->tm_mon - 1] && ptTime->tm_hour < 24 && ptTime->tm_min < 60) { return FLAG_MIN | FLAG_HOUR | FLAG_DAY | FLAG_MONTH | FLAG_YEAR; } /* YYYYMMDDHH */ ptTime->tm_year = (pChar[0] - '0') * 1000 + (pChar[1] - '0') * 100 + (pChar[2] - '0') * 10 + (pChar[3] - '0'); ptTime->tm_mon = (pChar[4] - '0') * 10 + (pChar[5] - '0'); ptTime->tm_mday = (pChar[6] - '0') * 10 + (pChar[7] - '0'); ptTime->tm_hour = (pChar[8] - '0') * 10 + (pChar[9] - '0'); if (ptTime->tm_hour < 24 && ptTime->tm_year >= 1900 && ptTime->tm_year < 2036 && ptTime->tm_mon < 13 && ptTime->tm_mday <= 29 + s_iMonthFix[ptTime->tm_mon - 1]) { return FLAG_HOUR | FLAG_DAY | FLAG_MONTH | FLAG_YEAR; } } /* (iLen == 10) */ /* 8字节, 有: MMDDHHmm, YYYYMMDD, DDHHmmss, YYMMDDHH */ else if (iLen == 8) { /* MMDDHHmm */ ptTime->tm_mon = (pChar[0] - '0') * 10 + (pChar[1] - '0'); ptTime->tm_mday = (pChar[2] - '0') * 10 + (pChar[3] - '0'); ptTime->tm_hour = (pChar[4] - '0') * 10 + (pChar[5] - '0'); ptTime->tm_min = (pChar[6] - '0') * 10 + (pChar[7] - '0'); if (ptTime->tm_mon < 13 && ptTime->tm_mday <= 29 + s_iMonthFix[ptTime->tm_mon - 1] && ptTime->tm_hour < 24 && ptTime->tm_min < 60) { return FLAG_MIN | FLAG_HOUR | FLAG_DAY | FLAG_MONTH; } /* YYYYMMDD */ ptTime->tm_year = (pChar[0] - '0') * 1000 + (pChar[1] - '0') * 100 + (pChar[2] - '0') * 10 + (pChar[3] - '0'); ptTime->tm_mon = (pChar[4] - '0') * 10 + (pChar[5] - '0'); ptTime->tm_mday = (pChar[6] - '0') * 10 + (pChar[7] - '0'); if (ptTime->tm_year >= 1900 && ptTime->tm_year < 2036 && ptTime->tm_mon < 13 && ptTime->tm_mday <= 29 + s_iMonthFix[ptTime->tm_mon - 1]) { return FLAG_DAY | FLAG_MONTH | FLAG_YEAR; } /* DDHHmmss */ ptTime->tm_mday = (pChar[0] - '0') * 10 + (pChar[1] - '0'); ptTime->tm_hour = (pChar[2] - '0') * 10 + (pChar[3] - '0'); ptTime->tm_min = (pChar[4] - '0') * 10 + (pChar[5] - '0'); ptTime->tm_sec = (pChar[6] - '0') * 10 + (pChar[7] - '0'); if (ptTime->tm_mday <= 31 && ptTime->tm_hour < 24 && ptTime->tm_min < 60 && ptTime->tm_sec < 60) { return FLAG_SEC | FLAG_MIN | FLAG_HOUR | FLAG_DAY; } /* YYMMDDHH */ ptTime->tm_year = (pChar[0] - '0') * 10 + (pChar[1] - '0'); ptTime->tm_year+= (ptTime->tm_year >= 70) ? 1900 : 2000; ptTime->tm_mon = (pChar[2] - '0') * 10 + (pChar[3] - '0'); ptTime->tm_mday = (pChar[4] - '0') * 10 + (pChar[5] - '0'); ptTime->tm_hour = (pChar[6] - '0') * 10 + (pChar[7] - '0'); if (ptTime->tm_hour < 24 && ptTime->tm_year >= 1900 && ptTime->tm_year < 2036 && ptTime->tm_mon < 13 && ptTime->tm_mday <= 29 + s_iMonthFix[ptTime->tm_mon - 1]) { return FLAG_HOUR | FLAG_DAY | FLAG_MONTH | FLAG_YEAR; } } /* (iLen == 8) */ else { /* YYMMDD */ ptTime->tm_year = (pChar[0] - '0') * 10 + (pChar[1] - '0'); ptTime->tm_year+= (ptTime->tm_year >= 70) ? 1900 : 2000; ptTime->tm_mon = (pChar[2] - '0') * 10 + (pChar[3] - '0'); ptTime->tm_mday = (pChar[4] - '0') * 10 + (pChar[5] - '0'); if (ptTime->tm_year >= 1900 && ptTime->tm_year < 2036 && ptTime->tm_mon < 13 && ptTime->tm_mday <= 29 + s_iMonthFix[ptTime->tm_mon - 1]) { return FLAG_DAY | FLAG_MONTH | FLAG_YEAR; } /* YYYYMM */ ptTime->tm_year = (pChar[0] - '0') * 1000 + (pChar[1] - '0') * 100 + (pChar[2] - '0') * 10 + (pChar[3] - '0'); ptTime->tm_mon = (pChar[4] - '0') * 10 + (pChar[5] - '0'); if (ptTime->tm_year >= 1900 && ptTime->tm_year < 2036 && ptTime->tm_mon < 13) { return FLAG_MONTH | FLAG_YEAR; } /* HHmmss */ ptTime->tm_hour = (pChar[0] - '0') * 10 + (pChar[1] - '0'); ptTime->tm_min = (pChar[2] - '0') * 10 + (pChar[3] - '0'); ptTime->tm_sec = (pChar[4] - '0') * 10 + (pChar[5] - '0'); if (ptTime->tm_hour < 24 && ptTime->tm_min < 60 && ptTime->tm_sec < 60) { return FLAG_SEC | FLAG_MIN | FLAG_HOUR; } /* DDHHmm */ ptTime->tm_mday = (pChar[0] - '0') * 10 + (pChar[1] - '0'); ptTime->tm_hour = (pChar[2] - '0') * 10 + (pChar[3] - '0'); ptTime->tm_min = (pChar[4] - '0') * 10 + (pChar[5] - '0'); if (ptTime->tm_mday <= 31 && ptTime->tm_hour < 24 && ptTime->tm_min < 60) { return FLAG_MIN | FLAG_HOUR | FLAG_DAY; } /* MMDDHH */ ptTime->tm_mon = (pChar[0] - '0') * 10 + (pChar[1] - '0'); ptTime->tm_mday = (pChar[2] - '0') * 10 + (pChar[3] - '0'); ptTime->tm_hour = (pChar[4] - '0') * 10 + (pChar[5] - '0'); if (ptTime->tm_mon < 13 && ptTime->tm_mday <= 29 + s_iMonthFix[ptTime->tm_mon - 1] && ptTime->tm_hour < 24) { return FLAG_HOUR | FLAG_DAY | FLAG_MONTH; } } /* (iLen == 6) */ return 0; } /* digit2time() */ /***************************************************************************** * 函数名称 : strtotime(*) * 功能描述 : 将日期及(或)时间字符串转换为时间结构, 例: Dec 19 2008, 13:35:40 * 读全局变量 : 无 * 写全局变量 : 无 * 输入参数 : timeStr - 时间日期字符串 * 输出参数 : ptTime - 日期时间结构 * 返 回 值 : 年月日时分秒有效的标志 * 其它说明 : 时分秒之间必须使用冒号":"分隔, 并且必然是此顺序 *--------------------------------------------------------------------------- * 历史记录(变更单, 责任人@修改日期, 操作说明) * $0000000(N/A), 田瑞忠@2008-12-27 16:14:59 创建 *---------------------------------------------------------------------------- */ static int strtotime(char *timeStr, struct tm *ptTime) { int iFlags, iVal, iLen, iStep, iDateTimeFlag; int iYear, iMonth, iDay, iHour, iMinute, iSecond; char *pChar = timeStr, *pCharEnd = timeStr, tempStr[8]; iDateTimeFlag = iYear = iMonth = iDay = iHour = iMinute = iSecond = 0; memset(ptTime, 0, sizeof(*ptTime)); /* 跳过前导空格 */ while (*pChar == ' ' || *pChar == ' ') { pChar++; } /* 不存在可解析的中间字符串 */ if ((iLen = nextTimeToken(pChar, &iVal, &iFlags)) <= 0) { return iDateTimeFlag; } /* 数值串且长度大于等于6, 则为全数字型日期时间, 如20081229080306 * 需要重新解析 */ if (iFlags == TOKEN_VAL && iLen >= 6 && iLen % 2 == 0) { iDateTimeFlag = digit2time(pChar, iLen, ptTime); if (iDateTimeFlag == 0) { memset(ptTime, 0, sizeof(*ptTime)); } /* 由于进行了值尝试, 当不适用时, 要清除尝试值 */ ptTime->tm_year = (iDateTimeFlag & FLAG_YEAR) ? ptTime->tm_year - 1900 : 0; ptTime->tm_mon = (iDateTimeFlag & FLAG_MONTH) ? ptTime->tm_mon - 1 : 0; if ((iDateTimeFlag & FLAG_DAY) == 0) { ptTime->tm_mday = 1; } if ((iDateTimeFlag & FLAG_HOUR) == 0) { ptTime->tm_hour = 0; } if ((iDateTimeFlag & FLAG_MIN) == 0) { ptTime->tm_min = 0; } if ((iDateTimeFlag & FLAG_SEC) == 0) { ptTime->tm_sec = 0; } if (!iDateTimeFlag) { goto strToTimeErrOut; } return iDateTimeFlag; } /* 否则各字段之间必然有分隔符(或数字英文分隔, 比如 22sep92) */ for (iStep = STEP_INIT; *pChar != EOS && iLen > 0; pChar += iLen, iLen = nextTimeToken(pChar, &iVal, &iFlags)) { /* 强格式年份, 直接填充到年份信息中 */ if (iFlags == TOKEN_YEAR) { if ((iDateTimeFlag & FLAG_YEAR) == 0) { iYear = iVal, iDateTimeFlag |= FLAG_YEAR; } else { goto strToTimeErrOut; } iStep = STEP_DATE, iDateTimeFlag |= FLAG_DATE; continue; } /* 强格式月份, 直接填充到月份信息中(否则需要试探比较) */ else if (iFlags == TOKEN_MONTH) { if ((iDateTimeFlag & FLAG_MONTH) == 0) { iMonth = iVal, iDateTimeFlag |= FLAG_ALPHA | FLAG_MONTH; } /* 有月份信息但非字母指定, 说明是试探, 则将其移走(值必居于1~12) */ else if ((iDateTimeFlag & FLAG_ALPHA) == 0) { if ((iDateTimeFlag & FLAG_DAY) == 0) { iDay = iMonth, iDateTimeFlag |= FLAG_DAY; } else if ((iDateTimeFlag & FLAG_YEAR) == 0) /* 2001 ~ 2012年 */ { iYear = iMonth, iDateTimeFlag |= FLAG_YEAR; } else { goto strToTimeErrOut; } iMonth = iVal, iDateTimeFlag |= FLAG_ALPHA; } else { goto strToTimeErrOut; } iStep = STEP_DATE, iDateTimeFlag |= FLAG_DATE; continue; } /* (iFlags == TOKEN_MONTH) */ /* 强格式日期, 直接填充到日期信息中 */ else if (iFlags == TOKEN_DAY) { if ((iDateTimeFlag & FLAG_DAY) == 0) { iDay = iVal, iDateTimeFlag |= FLAG_DAY; } else { goto strToTimeErrOut; } iStep = STEP_DATE, iDateTimeFlag |= FLAG_DATE; continue; } /* 半日信息(上午, 下午, 必然在时间后, 不然不予认可) */ else if (iFlags == TOKEN_HALFDAY) { if ((iDateTimeFlag & FLAG_HALFDAY) == 0 && iHour + iVal * 12 < 24) { iHour += iVal * 12, iDateTimeFlag |= FLAG_HALFDAY; } else { goto strToTimeErrOut; } iStep = STEP_TIME, iDateTimeFlag |= FLAG_TIME; continue; } /* 强格式小时, 直接填充到小时信息中 */ else if (iFlags == TOKEN_HOUR) { if ((iDateTimeFlag & FLAG_HOUR) == 0 && iVal < 24) { iHour = iVal, iDateTimeFlag |= FLAG_HOUR; } else { goto strToTimeErrOut; } iStep = STEP_TIME, iDateTimeFlag |= FLAG_TIME; continue; } /* 强格式分钟, 直接填充到分钟信息中 */ else if (iFlags == TOKEN_MIN) { if ((iDateTimeFlag & FLAG_MIN) == 0 && iVal < 60) { iMinute = iVal, iDateTimeFlag |= FLAG_MIN; } else { goto strToTimeErrOut; } iStep = STEP_TIME, iDateTimeFlag |= FLAG_TIME; continue; } /* 强格式秒, 直接填充到秒信息中 */ else if (iFlags == TOKEN_SEC) { if ((iDateTimeFlag & FLAG_SEC) == 0 && iVal < 60) { iSecond = iVal, iDateTimeFlag |= FLAG_SEC; } else { goto strToTimeErrOut; } iStep = STEP_TIME, iDateTimeFlag |= FLAG_TIME; continue; } /* 不是数值, 跳过 */ if (iFlags != TOKEN_VAL) { continue; } /* 标记尾碰到时间分隔符, 则直接进入时间信息处理区 */ if (IsTimeDelim(pChar[iLen])) { if ((iDateTimeFlag & FLAG_TIME) == 0) { iStep = STEP_TIME, iDateTimeFlag |= FLAG_TIME; } /* 如果时间信息已获取, 且在处理日期状态, 则跳过 */ else if (iStep == STEP_DATE) { iStep = STEP_OVER; } } /* 时间信息处理区, 但没有碰到时间分隔符, 则要切换处理区 */ else if (iStep == STEP_TIME) { if (IsTimeDelim(pChar[0])) { /* 最后一个字段, 状态保持 */; } else if ((iDateTimeFlag & FLAG_DATE) == 0) { iStep = STEP_DATE, iDateTimeFlag |= FLAG_DATE; } /* 如果日期信息已获取, 且在处理时间状态, 则跳过 */ else { iStep = STEP_OVER; } } /* 默认情况下都是处理日期 */ else { iStep = STEP_DATE; } /* 处理时间: 时分秒, 逐次检查(秒可能被省略) */ if (iStep == STEP_TIME) { if ((iDateTimeFlag & FLAG_HOUR) == 0) { if (iVal >= 0 && iVal <= 23) { iHour = iVal, iDateTimeFlag |= FLAG_HOUR; } else { goto strToTimeErrOut; } } else if ((iDateTimeFlag & FLAG_MIN) == 0) { if (iVal >= 0 && iVal <= 59) { iMinute = iVal, iDateTimeFlag |= FLAG_MIN; } else { goto strToTimeErrOut; } } else if ((iDateTimeFlag & FLAG_SEC) == 0) { if (iVal >= 0 && iVal <= 59) { iSecond = iVal, iDateTimeFlag |= FLAG_SEC; } else { goto strToTimeErrOut; } } else /* 多余的时间数据, 则认为字符串不合法 */ { goto strToTimeErrOut; } continue; } /* if (iStep == STEP_TIME) */ /* 日期处理, 日期格式只有三种: 月日年, 日月年, 年月日, 03oct01? * 歧议日期一律按"月日年"顺序处理, 上例是01年10月3日而不是03年10月1日 */ /* 四位数字年份, 毫无疑问直接填充 */ if (iVal >= 1900 && iVal <= 2036) { if ((iDateTimeFlag & FLAG_YEAR) == 0) { iYear = iVal, iDateTimeFlag |= FLAG_YEAR; } else { goto strToTimeErrOut; } } /* 两位数字无争议年份, 填充 */ else if (iVal == 0 || (iVal >= 70 && iVal <= 99)) { if ((iDateTimeFlag & FLAG_YEAR) == 0) { iYear = iVal, iDateTimeFlag |= FLAG_YEAR; } else { goto strToTimeErrOut; } } else if (iVal <= 12) /* 小于12的数字, 年月日都可以 */ { /* 写入月份读数时要检测日期读数冲突 */ if ((iDateTimeFlag & FLAG_MONTH) == 0) { if ((iDateTimeFlag & FLAG_DAY) == 0 || iDay <= 29 + s_iMonthFix[iVal - 1]) { iMonth = iVal, iDateTimeFlag |= FLAG_MONTH; } else if ((iDateTimeFlag & FLAG_YEAR) == 0) { iYear = iVal, iDateTimeFlag |= FLAG_YEAR; } else { goto strToTimeErrOut; } } else if ((iDateTimeFlag & FLAG_DAY) == 0) { iDay = iVal, iDateTimeFlag |= FLAG_DAY; } else if ((iDateTimeFlag & FLAG_YEAR) == 0) { iYear = iVal, iDateTimeFlag |= FLAG_YEAR; } else { goto strToTimeErrOut; } } else if (iVal <= 31 /* && iVal > 12 */) { /* 写入日期读数时要检测月份读数冲突 */ if ((iDateTimeFlag & FLAG_DAY) == 0) { if ((iDateTimeFlag & FLAG_MONTH) == 0 || iVal <= 29 + s_iMonthFix[iMonth - 1]) { iDay = iVal, iDateTimeFlag |= FLAG_DAY; } else if ((iDateTimeFlag & FLAG_YEAR) == 0) { iYear = iVal, iDateTimeFlag |= FLAG_YEAR; } else { goto strToTimeErrOut; } } else if ((iDateTimeFlag & FLAG_YEAR) == 0) { iYear = iVal, iDateTimeFlag |= FLAG_YEAR; } else { goto strToTimeErrOut; } } else if (iVal > 31 && iVal <= 36) { if ((iDateTimeFlag & FLAG_YEAR) == 0) { iYear = iVal, iDateTimeFlag |= FLAG_YEAR; } else { goto strToTimeErrOut; } } else /* 不合法的读数 */ { goto strToTimeErrOut; } } /* while (*pChar != EOS && iLen > 0) */ /* 对于存在歧议的日期及时间, 目前的默认顺序是: 月份, 日期, 年份 * 使用这个规则的原因在于, 月份的限制最严格(1~12), 其次日期(1~31), 年份任意, * 按这个顺序填入日期读数, 可以避免冲突数据的搬移操作, * 要改变这个默认规则, 只需在下面检查是否存在歧议, 然后修改顺序即可 */ /* 年份读数转换为内部表示 */ if (iDateTimeFlag & FLAG_YEAR) { if (iYear > 2036) { goto strToTimeErrOut; } else if (iYear >= 1900) { ptTime->tm_year = iYear - 1900; } else if (iYear >= 0 && iYear < 36) { ptTime->tm_year = iYear + 100; } else if (iYear >= 70 && iYear <= 99) { ptTime->tm_year = iYear; } else { goto strToTimeErrOut; } } /* (iDateTimeFlag & FLAG_YEAR) */ /* 月份读数也要转换为内部表示(0~11) */ if (iDateTimeFlag & FLAG_MONTH) { if (iMonth < 1 || iMonth > 12) { goto strToTimeErrOut; } ptTime->tm_mon = iMonth - 1; } /* 日期, 要查看是否满足条件 */ if (iDateTimeFlag & FLAG_DAY) { if ((iDay > 29 + s_iMonthFix[ptTime->tm_mon]) || (ptTime->tm_mon == 1 && !LeapYear(iYear) && iDay > 28)) { goto strToTimeErrOut; } ptTime->tm_mday = iDay; } else { ptTime->tm_mday = 1; } /* 时间值在赋值时都是合法的 */ ptTime->tm_hour = iHour; ptTime->tm_min = iMinute; ptTime->tm_sec = iSecond; return iDateTimeFlag; strToTimeErrOut: memset(ptTime, 0, sizeof(*ptTime)); ptTime->tm_mday = 1; printf("Unrecognized date and/or time string: %s ", timeStr); return 0; } /* strtotime() */ /***************************************************************************** * 函数名称 : strtotimeTest(*) * 功能描述 : 字符串转换为日期时间函数测试, 可以反复验证转换函数的正确性 * 读全局变量 : 无 * 写全局变量 : 无 * 输入参数 : 等待用户输入 * 输出参数 : 无 * 返 回 值 : OK * 其它说明 : 修改为main()函数后可在PC上调试 *--------------------------------------------------------------------------- * 历史记录(变更单, 责任人@修改日期, 操作说明) * $0000000(N/A), 田瑞忠@2008-12-28 20:42:26 *---------------------------------------------------------------------------- */ int strtotimeTest(void) { char charbuf[80]; struct tm timeStru; int iret; while (1) { printf("Input string to be converted, 'q' for quit: "); gets(charbuf); if (charbuf[0] == 'q') { break; } iret = strtotime(charbuf, &timeStru); printf("conver result %d: %04d-%02d-%02d, %02d:%02d:%02d ", iret, timeStru.tm_year + 1900, timeStru.tm_mon + 1, timeStru.tm_mday, timeStru.tm_hour, timeStru.tm_min, timeStru.tm_sec); } return iret; } /* strtotimeTest() */
    mktime（将时间结构数据转换成经过的秒数） 
相关函数  time，asctime，gmtime，localtime

表头文件  #include

定义函数  time_t mktime(strcut tm * timeptr);

函数说明  mktime()用来将参数timeptr所指的tm结构数据转换成从公元1970年1月1日0时0分0 秒算起至今的UTC时间所经过的秒数。

返回值  返回经过的秒数。

将两个数都mktime，然后求差  

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