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Add UTC string parsing functions

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Change-Id: I51cbb2274e26811d28b303375ff75a32e272adcc
This commit is contained in:
Marco van Dijk 2023-01-04 11:34:24 +01:00 • committed by Thulinma
parent 62b14d958d
commit 00d9b66602
2 changed files with 35 additions and 0 deletions
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33
lib/timing.cpp
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@ -6,6 +6,8 @@
#include <cstring>
#include <sys/time.h> //for gettimeofday
#include <time.h> //for time and nanosleep
#include <sstream>
#include <stdlib.h>
// emulate clock_gettime() for OSX compatibility
#if defined(__APPLE__) || defined(__MACH__)
@ -122,6 +124,37 @@ std::string Util::getUTCStringMillis(uint64_t epoch_millis){
return std::string(result);
}
// Returns the epoch of a UTC string in the format of %Y-%m-%dT%H:%M:%S%z
uint64_t Util::getMSFromUTCString(std::string UTCString){
if (UTCString.size() < 24){return 0;}
// Strip milliseconds
std::string millis = UTCString.substr(UTCString.rfind('.') + 1, 3);
UTCString = UTCString.substr(0, UTCString.rfind('.')) + "Z";
struct tm ptm;
memset(&ptm, 0, sizeof(struct tm));
strptime(UTCString.c_str(), "%Y-%m-%dT%H:%M:%S%z", &ptm);
time_t ts = mktime(&ptm);
return ts * 1000 + atoll(millis.c_str());
}
// Converts epoch_millis into UTC time and returns the diff with UTCString in seconds
uint64_t Util::getUTCTimeDiff(std::string UTCString, uint64_t epochMillis){
if (!epochMillis){return 0;}
if (UTCString.size() < 24){return 0;}
// Convert epoch to UTC time
time_t epochSeconds = epochMillis / 1000;
struct tm *ptmEpoch;
ptmEpoch = gmtime(&epochSeconds);
uint64_t epochTime = mktime(ptmEpoch);
// Parse UTC string and strip the milliseconds
UTCString = UTCString.substr(0, UTCString.rfind('.')) + "Z";
struct tm ptmUTC;
memset(&ptmUTC, 0, sizeof(struct tm));
strptime(UTCString.c_str(), "%Y-%m-%dT%H:%M:%S%z", &ptmUTC);
time_t UTCTime = mktime(&ptmUTC);
return epochTime - UTCTime;
}
std::string Util::getDateString(uint64_t epoch){
char buffer[80];
time_t rawtime = epoch;

2
lib/timing.h
View file

@ -18,5 +18,7 @@ namespace Util{
uint64_t epoch(); ///< Gets the amount of seconds since 01/01/1970.
std::string getUTCString(uint64_t epoch = 0);
std::string getUTCStringMillis(uint64_t epoch_millis = 0);
uint64_t getMSFromUTCString(std::string UTCString);
uint64_t getUTCTimeDiff(std::string UTCString, uint64_t epochMillis);
std::string getDateString(uint64_t epoch = 0);
}// namespace Util