/
datetime.cpp
1456 lines (1357 loc) · 37.7 KB
/
datetime.cpp
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/*
* Copyright 2013 Jonathan R. Guthrie
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <iomanip>
#include <sstream>
#include <string.h>
#include <stdlib.h>
#include "datetime.hpp"
DateTime::DateTime(STRING_FORMAT format) {
m_format = format;
time_t t = time(NULL);
localtime_r(&t, &m_tm);
m_zone = timezone;
m_valid = true;
}
DateTime::DateTime(const uint8_t *data, size_t dataLen, size_t &parsingAt, STRING_FORMAT format) throw(DateTimeInvalidDateTime) {
// The first character should be a double-quote
if (!parse(data, dataLen, parsingAt, format)) {
throw DateTimeInvalidDateTime();
}
}
DateTime::~DateTime() {
}
const std::string DateTime::str(void) const throw(DateTimeInvalidDateTime) {
if (!m_valid) {
throw DateTimeInvalidDateTime();
}
std::stringstream ss;
const char *wdayTable[] = {"Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"};
const char *monthTable[] = {"Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"};
switch(m_format) {
case IMAP:
ss << std::setw(2) << m_tm.tm_mday << "-" <<
monthTable[m_tm.tm_mon] << "-" <<
(m_tm.tm_year + 1900) << " " <<
std::setw(2) << std::setfill('0') << m_tm.tm_hour << ":" <<
std::setw(2) << std::setfill('0') << m_tm.tm_min << ":" <<
std::setw(2) << std::setfill('0') << m_tm.tm_sec << " ";
if (0 < m_zone) {
ss << '-';
}
else {
ss << '+';
}
{
unsigned z = abs(m_zone);
ss << std::setw(2) << std::setfill('0') << z / 3600;
ss << std::setw(2) << std::setfill('0') << ((z / 60) % 60);
}
break;
case FROM_LINE:
ss << wdayTable[m_tm.tm_wday] << " " << monthTable[m_tm.tm_mon] << " " <<
std::setw(2) << m_tm.tm_mday << " " <<
std::setw(2) << std::setfill('0') << m_tm.tm_hour << ":" <<
std::setw(2) << std::setfill('0') << m_tm.tm_min << ":" <<
std::setw(2) << std::setfill('0') << m_tm.tm_sec << " " <<
(m_tm.tm_year + 1900) << " ";
ss << std::setw(2) << m_tm.tm_mday << "-" <<
monthTable[m_tm.tm_mon] << "-" <<
(m_tm.tm_year + 1900) << " " <<
std::setw(2) << std::setfill('0') << m_tm.tm_hour << ":" <<
std::setw(2) << std::setfill('0') << m_tm.tm_min << ":" <<
std::setw(2) << std::setfill('0') << m_tm.tm_sec << " ";
if (0 < m_zone) {
ss << '-';
}
else {
ss << '+';
}
{
unsigned z = abs(m_zone);
ss << std::setw(2) << std::setfill('0') << z / 3600;
ss << std::setw(2) << std::setfill('0') << ((z / 60) % 60);
}
break;
case CTIME:
default:
ss << wdayTable[m_tm.tm_wday] << " " << monthTable[m_tm.tm_mon] << " " <<
std::setw(2) << m_tm.tm_mday << " " <<
std::setw(2) << std::setfill('0') << m_tm.tm_hour << ":" <<
std::setw(2) << std::setfill('0') << m_tm.tm_min << ":" <<
std::setw(2) << std::setfill('0') << m_tm.tm_sec << " " <<
(m_tm.tm_year + 1900) << " ";
break;
}
return ss.str();
}
bool DateTime::operator< (DateTime right) {
time_t tr = mktime(&right.m_tm);
time_t tl = mktime(&m_tm);
return tl < tr;
}
bool DateTime::operator<= (DateTime right) {
time_t tr = mktime(&right.m_tm);
time_t tl = mktime(&m_tm);
return tl <= tr;
}
bool DateTime::operator> (DateTime right) {
time_t tr = mktime(&right.m_tm);
time_t tl = mktime(&m_tm);
return tl > tr;
}
bool DateTime::operator>= (DateTime right) {
time_t tr = mktime(&right.m_tm);
time_t tl = mktime(&m_tm);
return tl >= tr;
}
void DateTime::addDays(int days) {
time_t t = mktime(&m_tm);
t += (86400 * days);
localtime_r(&t, &m_tm);
}
// ctime returns
// DOW MMM DD hh:mm:ss YYYY
// Note, no time zone.
bool DateTime::parseCtime(const uint8_t *data, size_t dataLen, size_t &parsingAt) {
(void) dataLen;
m_valid = false;
// Day of week
// tuesday and thursday
if ('T' == toupper(data[parsingAt])) {
if (('U' == toupper(data[parsingAt+1])) && ('E' == toupper(data[parsingAt+2]))) {
m_tm.tm_wday = 2;
}
else if (('H' == toupper(data[parsingAt+1])) && ('U' == toupper(data[parsingAt+2]))) {
m_tm.tm_wday = 4;
}
else {
return false;
}
}
else if ('S' == toupper(data[parsingAt])) {
if (('A' == toupper(data[parsingAt+1])) && ('T' == toupper(data[parsingAt+2]))) {
m_tm.tm_wday = 6;
}
else if (('U' == toupper(data[parsingAt+1])) && ('N' == toupper(data[parsingAt+2]))) {
m_tm.tm_wday = 0;
}
else {
return false;
}
}
else if (('M' == toupper(data[parsingAt])) && ('O' == toupper(data[parsingAt+1])) && ('N' == toupper(data[parsingAt+2]))) {
m_tm.tm_wday = 1;
}
else if (('W' == toupper(data[parsingAt])) && ('E' == toupper(data[parsingAt+1])) && ('D' == toupper(data[parsingAt+2]))) {
m_tm.tm_wday = 3;
}
else if (('F' == toupper(data[parsingAt])) && ('R' == toupper(data[parsingAt+1])) && ('I' == toupper(data[parsingAt+2]))) {
m_tm.tm_wday = 5;
}
else {
return false;
}
if (' ' != data[parsingAt]) {
return false;
}
++parsingAt;
// Check Jan, Jun, and Jul first
if ('J' == toupper(data[parsingAt])) {
// Jun or Jul
if ('U' == toupper(data[parsingAt+1])) {
if ('N' == toupper(data[parsingAt+2])) {
m_tm.tm_mon = 5;
}
else if ('L' == toupper(data[parsingAt+2])) {
m_tm.tm_mon = 6;
}
else {
return false;
}
}
else if (('A' == toupper(data[parsingAt+1])) && ('N' == toupper(data[parsingAt+2]))) {
m_tm.tm_mon = 0;
}
else {
return false;
}
}
// Next, Mar and May
else if (('M' == toupper(data[parsingAt])) && ('A' == toupper(data[parsingAt+1]))) {
if ('R' == toupper(data[parsingAt+2])) {
m_tm.tm_mon = 2;
}
else if ('Y' == toupper(data[parsingAt+2])) {
m_tm.tm_mon = 4;
}
else {
return false;
}
}
// Next Apr and Aug
else if ('A' == toupper(data[parsingAt])) {
if (('P' == toupper(data[parsingAt+1])) && ('R' == toupper(data[parsingAt+2]))) {
m_tm.tm_mon = 3;
}
else {
if (('U' == toupper(data[parsingAt+1])) && ('G' == toupper(data[parsingAt+2]))) {
m_tm.tm_mon = 7;
}
else {
return false;
}
}
}
// Feb
else if (('F' == toupper(data[parsingAt])) && ('E' == toupper(data[parsingAt+1])) && ('B' == toupper(data[parsingAt+2]))) {
m_tm.tm_mon = 1;
}
// Sep
else if (('S' == toupper(data[parsingAt])) && ('E' == toupper(data[parsingAt+1])) && ('P' == toupper(data[parsingAt+2]))) {
m_tm.tm_mon = 8;
}
// Oct
else if (('O' == toupper(data[parsingAt])) && ('C' == toupper(data[parsingAt+1])) && ('T' == toupper(data[parsingAt+2]))) {
m_tm.tm_mon = 9;
}
// Nov
else if (('N' == toupper(data[parsingAt])) && ('O' == toupper(data[parsingAt+1])) && ('V' == toupper(data[parsingAt+2]))) {
m_tm.tm_mon = 10;
}
// Dec
else if (('D' == toupper(data[parsingAt])) && ('E' == toupper(data[parsingAt+1])) && ('C' == toupper(data[parsingAt+2]))) {
m_tm.tm_mon = 11;
}
else {
return false;
}
parsingAt += 3;
if (' ' != data[parsingAt]) {
return false;
}
++parsingAt;
m_tm.tm_mday = 0;
if (' ' == data[parsingAt]) {
++parsingAt;
if (isdigit(data[parsingAt])) {
m_tm.tm_mday = data[parsingAt] - '0';
++parsingAt;
}
else {
return false;
}
}
else {
if (isdigit(data[parsingAt])) {
m_tm.tm_mday = data[parsingAt] - '0';
++parsingAt;
if (isdigit(data[parsingAt])) {
m_tm.tm_mday = m_tm.tm_mday * 10 + data[parsingAt] - '0';
++parsingAt;
}
}
else {
return false;
}
}
if (' ' != data[parsingAt]) {
return false;
}
++parsingAt;
m_tm.tm_hour = 0;
if (' ' == data[parsingAt]) {
++parsingAt;
if (isdigit(data[parsingAt])) {
m_tm.tm_hour = data[parsingAt] - '0';
++parsingAt;
}
else {
return false;
}
}
else {
if (isdigit(data[parsingAt])) {
m_tm.tm_hour = data[parsingAt] - '0';
++parsingAt;
if (isdigit(data[parsingAt])) {
m_tm.tm_hour = m_tm.tm_hour * 10 + data[parsingAt] - '0';
++parsingAt;
}
}
else {
return false;
}
}
if (':' != data[parsingAt]) {
return false;
}
m_tm.tm_min = 0;
if (isdigit(data[parsingAt])) {
m_tm.tm_min = data[parsingAt] - '0';
++parsingAt;
if (isdigit(data[parsingAt])) {
m_tm.tm_min = m_tm.tm_min * 10 + data[parsingAt] - '0';
++parsingAt;
}
}
else {
return false;
}
m_tm.tm_sec = 0;
if (':' == data[parsingAt]) {
if (isdigit(data[parsingAt])) {
m_tm.tm_sec = data[parsingAt] - '0';
++parsingAt;
if (isdigit(data[parsingAt])) {
m_tm.tm_sec = m_tm.tm_sec * 10 + data[parsingAt] - '0';
++parsingAt;
}
}
else {
return false;
}
}
if (' ' != data[parsingAt]) {
return false;
}
++parsingAt;
m_tm.tm_year = (int) strtol((char *)&data[parsingAt], NULL, 10);
// 30 days hath september, april, june, and november
// all the rest have 31 except february
if (1 == m_tm.tm_mon) {
if ((29 < m_tm.tm_mday) ||
((29 == m_tm.tm_mday) &&
((0 != (m_tm.tm_year % 4)) || ((0 == m_tm.tm_year % 100) && (0 != m_tm.tm_year % 400))))) {
return false;
}
}
else {
if ((8 == m_tm.tm_mon) || (3 == m_tm.tm_mon) || (5 == m_tm.tm_mon) || (10 == m_tm.tm_mon)) {
if (30 < m_tm.tm_mday) {
return false;
}
}
else {
if (31 < m_tm.tm_mday) {
return false;
}
}
}
// One last correction, tm_year is defined to hold years since 1900, but what's in it at this point
// is years since zero, so I have to apply a correction. I can't correct it before now because if I
// do that, then Zeller's congruence may not work, so I correct it here.
m_tm.tm_year -= 1900;
tzset();
m_zone = timezone;
m_valid = true;
return true;
}
// I start with the pointer at a double quote, and I should end after the other double-quote
// A date-time string is "DD-MMM-YYYY HH:MM:SS +ZZZZ" (quotes not included)
// That looks to be 11+2+8+5 = 26 characters
bool DateTime::parseImap(const uint8_t *data, size_t dataLen, size_t &parsingAt) {
if (26 > (dataLen - parsingAt)) {
return false;
}
if (((' ' != data[parsingAt]) && !isdigit(data[parsingAt])) ||
!isdigit(data[parsingAt+1])) {
return false;
}
m_tm.tm_mday = strtol((const char *)&data[parsingAt], NULL, 10);
parsingAt += 2;
if ((m_tm.tm_mday < 1) || (m_tm.tm_mday > 31) || ('-' != data[parsingAt])) {
return false;
}
++parsingAt;
// Check Jan, Jun, and Jul first
if ('J' == toupper(data[parsingAt])) {
// Jun or Jul
if ('U' == toupper(data[parsingAt+1])) {
if ('N' == toupper(data[parsingAt+2])) {
if (m_tm.tm_mday > 30) {
return false;
}
m_tm.tm_mon = 5;
}
else if ('L' == toupper(data[parsingAt+2])) {
m_tm.tm_mon = 6;
}
else {
return false;
}
}
else if (('A' == toupper(data[parsingAt+1])) && ('N' == toupper(data[parsingAt+2]))) {
m_tm.tm_mon = 0;
}
else {
return false;
}
}
// Next, Mar and May
else if (('M' == toupper(data[parsingAt])) && ('A' == toupper(data[parsingAt+1]))) {
if ('R' == toupper(data[parsingAt+2])) {
m_tm.tm_mon = 2;
}
else if ('Y' == toupper(data[parsingAt+2])) {
m_tm.tm_mon = 4;
}
else {
return false;
}
}
// Next Apr and Aug
else if ('A' == toupper(data[parsingAt])) {
if (('P' == toupper(data[parsingAt+1])) && ('R' == toupper(data[parsingAt+2]))) {
if (m_tm.tm_mday > 30) {
return false;
}
m_tm.tm_mon = 3;
}
else {
if (('U' == toupper(data[parsingAt+1])) && ('G' == toupper(data[parsingAt+2]))) {
m_tm.tm_mon = 7;
}
else {
return false;
}
}
}
// Feb
else if (('F' == toupper(data[parsingAt])) && ('E' == toupper(data[parsingAt+1])) && ('B' == toupper(data[parsingAt+2]))) {
m_tm.tm_mon = 1;
if (m_tm.tm_mday > 29) {
return false;
}
}
// Sep
else if (('S' == toupper(data[parsingAt])) && ('E' == toupper(data[parsingAt+1])) && ('P' == toupper(data[parsingAt+2]))) {
if (m_tm.tm_mday > 30) {
return false;
}
m_tm.tm_mon = 8;
}
// Oct
else if (('O' == toupper(data[parsingAt])) && ('C' == toupper(data[parsingAt+1])) && ('T' == toupper(data[parsingAt+2]))) {
m_tm.tm_mon = 9;
}
// Nov
else if (('N' == toupper(data[parsingAt])) && ('O' == toupper(data[parsingAt+1])) && ('V' == toupper(data[parsingAt+2]))) {
if (m_tm.tm_mday > 30) {
return false;
}
m_tm.tm_mon = 10;
}
// Dec
else if (('D' == toupper(data[parsingAt])) && ('E' == toupper(data[parsingAt+1])) && ('C' == toupper(data[parsingAt+2]))) {
m_tm.tm_mon = 11;
}
else {
return false;
}
parsingAt += 3;
if ('-' != data[parsingAt]) {
return false;
}
++parsingAt;
if (!isdigit(data[parsingAt]) || !isdigit(data[parsingAt+1]) || !isdigit(data[parsingAt+2]) || !isdigit(data[parsingAt+3])) {
return false;
}
m_tm.tm_year = strtol((const char *)&data[parsingAt], NULL, 10);
parsingAt += 4;
// If I'm looking at Feb 29, then it needs to be a leap year
if ((1 == m_tm.tm_mon) && (29 == m_tm.tm_mday) &&
((0 != (m_tm.tm_year % 4)) || ((0 == m_tm.tm_year % 100) && (0 != m_tm.tm_year % 400)))) {
return false;
}
if (' ' != data[parsingAt]) {
return false;
}
++parsingAt;
if (!isdigit(data[parsingAt]) || !isdigit(data[parsingAt+1])) {
return false;
}
m_tm.tm_hour = strtol((const char *)&data[parsingAt], NULL, 10);
parsingAt += 2;
if (':' != data[parsingAt]) {
return false;
}
++parsingAt;
if (!isdigit(data[parsingAt]) || !isdigit(data[parsingAt+1])) {
return false;
}
m_tm.tm_min = strtol((const char *)&data[parsingAt], NULL, 10);
parsingAt += 2;
if (':' != data[parsingAt]) {
return false;
}
++parsingAt;
if (!isdigit(data[parsingAt]) || !isdigit(data[parsingAt+1])) {
return false;
}
m_tm.tm_sec = strtol((const char *)&data[parsingAt], NULL, 10);
parsingAt += 2;
if (' ' != data[parsingAt]) {
return false;
}
++parsingAt;
if ((('-' == data[parsingAt]) || ('+' == data[parsingAt])) &&
isdigit(data[parsingAt+1]) && isdigit(data[parsingAt+2]) && isdigit(data[parsingAt+3]) && isdigit(data[parsingAt+4])) {
// m_zone is seconds west of UTC but the string is +HHMM east of UTC
m_zone = 3600 * (10 * (data[parsingAt+1] - '0') + data[parsingAt+2] - '0') + 60 * (10 * (data[parsingAt+3] - '0') + data[parsingAt+4] - '0');
if ('+' == data[parsingAt]) {
m_zone *= -1;
}
}
else {
return false;
}
parsingAt += 5;
// Use Zeller's Congruence to calculate the day of the week
// See, for example http://en.wikipedia.org/wiki/Zeller's_congruence
int zYear;
int table[] = {0, 3, 2, 5, 0, 3, 5, 1, 4, 6, 2, 4};
zYear = (m_tm.tm_mon < 2) ? m_tm.tm_year - 1 : m_tm.tm_year;
m_tm.tm_wday = (zYear + zYear / 4 - zYear / 100 + zYear / 400 + table[m_tm.tm_mon] + m_tm.tm_mday) % 7;
// One last correction, tm_year is defined to hold years since 1900, but what's in it at this point
// is years since zero, so I have to apply a correction. I can't correct it before now because if I
// do that, then Zeller's congruence may not work, so I correct it here.
m_tm.tm_year -= 1900;
m_valid = true;
return true;
}
/*
* date-time = [ day-of-week "," ] date FWS time [CFWS]
*
* day-of-week = ([FWS] day-name) / obs-day-of-week
*
* day-name = "Mon" / "Tue" / "Wed" / "Thu" / "Fri" / "Sat" / "Sun"
*
* date = day month year
*
* year = 4*DIGIT / obs-year
*
* month = (FWS month-name FWS) / obs-month
*
* month-name = "Jan" / "Feb" / "Mar" / "Apr" /
* "May" / "Jun" / "Jul" / "Aug" /
* "Sep" / "Oct" / "Nov" / "Dec"
*
* day = [FWS] 1*2DIGIT / obs-day
*
* time = time-of-day FWS zone
*
* time-of-day = hour ":" minute [ ":" second ]
*
* hour = 2DIGIT / obs-hour
*
* minute = 2DIGIT / obs-minute
*
* second = 2DIGIT / obs-second
*
* zone = (( "+" / "-") 4DIGIT) / obs-zone
*
* obs-day-of-week = [CFWS] day-name [CFWS]
*
* obs-year = [CFWS] 2*DIGIT [CFWS]
*
* obs-month = CFWS month-name CFWS
*
* obs-day = [CFWS] 1*2DIGIT [CFWS]
*
* obs-hour = [CFWS] 2DIGIT [CFWS]
*
* obs-minute = [CFWS] 2DIGIT [CFWS]
*
* obs-second = [CFWS] 2DIGIT [CFWS]
*
* obs-zone = "UT" / "GMT" / "EST" / "EDT" / "CST" / "CDT" /
* "MST" / "MDT" / "PST" / "PDT" / %d65-73 / %d75-90
* %d97-105 / %d107-122
*
* If a two digit year is encoutered, it is interpreted as being the year less 2000 if
* the digits represent a number less than 50, otherwise it is interpreted as being the
* year less 1900. A three digit year is interpreted as being the year less 1900.
* the single-letter time zones, UT, and GMT are the same as +0000, the EDT is -0400,
* EST and CDT are -0500, CST and MDT are -0600, MST and PDT are -0700, and PST is -0800
*
* Okay, except for the two, three, and four-digit years and the time zone wierdness (and
* the time zone is important because it's essential for comparing dates) it appears as if
* the obsolete fields are the same as the current fields.
*/
bool DateTime::parseRfc822(const uint8_t *data, size_t dataLen, size_t &parsingAt) {
(void) dataLen;
m_valid = false;
// Day of week
// tuesday and thursday
if (NULL != strchr((const char *)&data[parsingAt], ',')) {
if ('T' == toupper(data[parsingAt])) {
if (('U' == toupper(data[parsingAt+1])) && ('E' == toupper(data[parsingAt+2]))) {
m_tm.tm_wday = 2;
}
else if (('H' == toupper(data[parsingAt+1])) && ('U' == toupper(data[parsingAt+2]))) {
m_tm.tm_wday = 4;
}
else {
return false;
}
}
else if ('S' == toupper(data[parsingAt])) {
if (('A' == toupper(data[parsingAt+1])) && ('T' == toupper(data[parsingAt+2]))) {
m_tm.tm_wday = 6;
}
else if (('U' == toupper(data[parsingAt+1])) && ('N' == toupper(data[parsingAt+2]))) {
m_tm.tm_wday = 0;
}
else {
return false;
}
}
else if (('M' == toupper(data[parsingAt])) && ('O' == toupper(data[parsingAt+1])) && ('N' == toupper(data[parsingAt+2]))) {
m_tm.tm_wday = 1;
}
else if (('W' == toupper(data[parsingAt])) && ('E' == toupper(data[parsingAt+1])) && ('D' == toupper(data[parsingAt+2]))) {
m_tm.tm_wday = 3;
}
else if (('F' == toupper(data[parsingAt])) && ('R' == toupper(data[parsingAt+1])) && ('I' == toupper(data[parsingAt+2]))) {
m_tm.tm_wday = 5;
}
else {
return false;
}
if (',' != data[parsingAt]) {
return false;
}
++parsingAt;
}
if (' ' != data[parsingAt]) {
return false;
}
while (' ' == data[parsingAt]) {
++parsingAt;
}
m_tm.tm_mday = 0;
if (!isdigit(data[parsingAt])) {
return false;
}
else {
m_tm.tm_mday = data[parsingAt] - '0';
++parsingAt;
if (isdigit(data[parsingAt])) {
m_tm.tm_mday = m_tm.tm_mday * 10 + data[parsingAt] - '0';
++parsingAt;
}
}
if (' ' != data[parsingAt]) {
return false;
}
m_tm.tm_mday = 0;
if (' ' == data[parsingAt]) {
++parsingAt;
if (isdigit(data[parsingAt])) {
m_tm.tm_mday = data[parsingAt] - '0';
++parsingAt;
}
else {
return false;
}
}
else {
if (isdigit(data[parsingAt])) {
m_tm.tm_mday = data[parsingAt] - '0';
++parsingAt;
if (isdigit(data[parsingAt])) {
m_tm.tm_mday = m_tm.tm_mday * 10 + data[parsingAt] - '0';
++parsingAt;
}
}
else {
return false;
}
}
if (' ' != data[parsingAt]) {
return false;
}
while (' ' == data[parsingAt]) {
++parsingAt;
}
// Check Jan, Jun, and Jul first
if ('J' == toupper(data[parsingAt])) {
// Jun or Jul
if ('U' == toupper(data[parsingAt+1])) {
if ('N' == toupper(data[parsingAt+2])) {
m_tm.tm_mon = 5;
}
else if ('L' == toupper(data[parsingAt+2])) {
m_tm.tm_mon = 6;
}
else {
return false;
}
}
else if (('A' == toupper(data[parsingAt+1])) && ('N' == toupper(data[parsingAt+2]))) {
m_tm.tm_mon = 0;
}
else {
return false;
}
}
// Next, Mar and May
else if (('M' == toupper(data[parsingAt])) && ('A' == toupper(data[parsingAt+1]))) {
if ('R' == toupper(data[parsingAt+2])) {
m_tm.tm_mon = 2;
}
else if ('Y' == toupper(data[parsingAt+2])) {
m_tm.tm_mon = 4;
}
else {
return false;
}
}
// Next Apr and Aug
else if ('A' == toupper(data[parsingAt])) {
if (('P' == toupper(data[parsingAt+1])) && ('R' == toupper(data[parsingAt+2]))) {
m_tm.tm_mon = 3;
}
else {
if (('U' == toupper(data[parsingAt+1])) && ('G' == toupper(data[parsingAt+2]))) {
m_tm.tm_mon = 7;
}
else {
return false;
}
}
}
// Feb
else if (('F' == toupper(data[parsingAt])) && ('E' == toupper(data[parsingAt+1])) && ('B' == toupper(data[parsingAt+2]))) {
m_tm.tm_mon = 1;
}
// Sep
else if (('S' == toupper(data[parsingAt])) && ('E' == toupper(data[parsingAt+1])) && ('P' == toupper(data[parsingAt+2]))) {
m_tm.tm_mon = 8;
}
// Oct
else if (('O' == toupper(data[parsingAt])) && ('C' == toupper(data[parsingAt+1])) && ('T' == toupper(data[parsingAt+2]))) {
m_tm.tm_mon = 9;
}
// Nov
else if (('N' == toupper(data[parsingAt])) && ('O' == toupper(data[parsingAt+1])) && ('V' == toupper(data[parsingAt+2]))) {
m_tm.tm_mon = 10;
}
// Dec
else if (('D' == toupper(data[parsingAt])) && ('E' == toupper(data[parsingAt+1])) && ('C' == toupper(data[parsingAt+2]))) {
m_tm.tm_mon = 11;
}
else {
return false;
}
parsingAt += 3;
if (' ' != data[parsingAt]) {
return false;
}
while (' ' == data[parsingAt]) {
++parsingAt;
}
m_tm.tm_year = (int) strtol((char *)&data[parsingAt], NULL, 10);
while (isdigit(data[parsingAt])) {
++parsingAt;
}
if (' ' != data[parsingAt]) {
return false;
}
while (' ' == data[parsingAt]) {
++parsingAt;
}
if (m_tm.tm_year < 1000) {
m_tm.tm_year += 1900;
}
else if (m_tm.tm_year < 100) {
if (m_tm.tm_year < 50) {
m_tm.tm_year += 2000;
}
else {
m_tm.tm_year += 1900;
}
}
// 30 days hath september, april, june, and november
// all the rest have 31 except february
if (1 == m_tm.tm_mon) {
if ((29 < m_tm.tm_mday) ||
((29 == m_tm.tm_mday) &&
((0 != (m_tm.tm_year % 4)) || ((0 == m_tm.tm_year % 100) && (0 != m_tm.tm_year % 400))))) {
return false;
}
}
else {
if ((8 == m_tm.tm_mon) || (3 == m_tm.tm_mon) || (5 == m_tm.tm_mon) || (10 == m_tm.tm_mon)) {
if (30 < m_tm.tm_mday) {
return false;
}
}
else {
if (31 < m_tm.tm_mday) {
return false;
}
}
}
m_tm.tm_hour = 0;
if (' ' == data[parsingAt]) {
++parsingAt;
if (isdigit(data[parsingAt])) {
m_tm.tm_hour = data[parsingAt] - '0';
++parsingAt;
}
else {
return false;
}
}
else {
if (isdigit(data[parsingAt])) {
m_tm.tm_hour = data[parsingAt] - '0';
++parsingAt;
if (isdigit(data[parsingAt])) {
m_tm.tm_hour = m_tm.tm_hour * 10 + data[parsingAt] - '0';
++parsingAt;
}
}
else {
return false;
}
}
if (':' != data[parsingAt]) {
return false;
}
m_tm.tm_min = 0;
if (isdigit(data[parsingAt])) {
m_tm.tm_min = data[parsingAt] - '0';
++parsingAt;
if (isdigit(data[parsingAt])) {
m_tm.tm_min = m_tm.tm_min * 10 + data[parsingAt] - '0';
++parsingAt;
}
}
else {
return false;
}
m_tm.tm_sec = 0;
if (':' == data[parsingAt]) {
if (isdigit(data[parsingAt])) {
m_tm.tm_sec = data[parsingAt] - '0';
++parsingAt;
if (isdigit(data[parsingAt])) {
m_tm.tm_sec = m_tm.tm_sec * 10 + data[parsingAt] - '0';
++parsingAt;
}
}
else {
return false;
}
}
if (' ' != data[parsingAt]) {
return false;
}
while (' ' == data[parsingAt]) {
++parsingAt;
}
m_zone = 99999;
if ('E' == toupper(data[parsingAt])) {
if (('D' == toupper(data[parsingAt+1])) && ('T' == toupper(data[parsingAt+2]))) {
m_zone = 14400;
}
else if (('S' == toupper(data[parsingAt+1])) && ('T' == toupper(data[parsingAt+2]))) {
m_zone = 18000;
}
else {
return false;
}
if (' ' != data[parsingAt+3]) {
return false;
}
parsingAt += 4;
}
else if ('C' == toupper(data[parsingAt])) {
if (('D' == toupper(data[parsingAt+1])) && ('T' == toupper(data[parsingAt+2]))) {
m_zone = 18000;
}
else if (('S' == toupper(data[parsingAt+1])) && ('T' == toupper(data[parsingAt+2]))) {
m_zone = 21600;
}
else {
return false;
}
if (' ' != data[parsingAt+3]) {
return false;
}
parsingAt += 4;
}
else if ('M' == toupper(data[parsingAt])) {
if (('D' == toupper(data[parsingAt+1])) && ('T' == toupper(data[parsingAt+2]))) {
m_zone = 21600;
}
else if (('S' == toupper(data[parsingAt+1])) && ('T' == toupper(data[parsingAt+2]))) {
m_zone = 25200;
}
else {
return false;
}
if (' ' != data[parsingAt+3]) {
return false;
}
parsingAt += 4;
}
else if ('P' == toupper(data[parsingAt])) {
if (('D' == toupper(data[parsingAt+1])) && ('T' == toupper(data[parsingAt+2]))) {
m_zone = 25200;
}
else if (('S' == toupper(data[parsingAt+1])) && ('T' == toupper(data[parsingAt+2]))) {
m_zone = 28800;
}
else {
return false;
}
if (' ' != data[parsingAt+3]) {
return false;
}
parsingAt += 4;
}
else if (('-' == data[parsingAt]) || ('+' == data[parsingAt])) {
if (isdigit(data[parsingAt+1]) && isdigit(data[parsingAt+2]) && isdigit(data[parsingAt+3]) && isdigit(data[parsingAt+4])) {
// m_zone is seconds west of UTC but the string is +HHMM east of UTC
m_zone = 3600 * (10 * (data[parsingAt+1] - '0') + data[parsingAt+2] - '0') + 60 * (10 * (data[parsingAt+3] - '0') + data[parsingAt+4] - '0');
if ('+' == data[parsingAt]) {