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Questions tagged [time-t]

`time_t` is a Standard-C data type to hold the seconds since UNIX epoch, that since the 1.1.1970.

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getting utc timestamp using strftime()

I am trying to encode current UTC time into string using the strftime function: time_t now; struct tm nowLocal; struct tm nowUtc; now = time(NULL); localtime_r(&now, &nowLocal); gmtime_r(&now, &nowUtc); So far so good: nowLocal contains current…
Petr
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Converting http date header string to time_t

I want to convert the http header field "Date", which is returned to me in the format "Wed, 07 Mar 2012 09:58:26 GMT", into a time_t value. I'm not sure if there's a standard format for this field in the http headers. I saw this: parsing of…
Itzuke
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Converting seconds since epoch to time_t

I have a string representing seconds since epoch, and I need to convert it to a human readable string. I've seen a few posts online that suggest simply casting an integer to time_t as so: time_t time = (time_t)(atoi(secs_since_epoch_str)); But, if…
HardcoreHenry
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Can I avoid going through time_t to print a time_point?

Here's an example adapted from cppreference.com : #include #include #include #include int main() { std::chrono::system_clock::time_point now = std::chrono::system_clock::now(); std::time_t now_c =…
einpoklum
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Get time_t / timeval corresponding to ( local_timezone ) midnight on a given date

Given a time_t or struct timeval, how do I get the timeval or time_t of midnight EST/EDT ( local timezone ) on that day ? As in assuming local timezone is EST/EDT, given a time_t corresponding to say 2010-11-30 08:00:00 EST/EDT, the expected answer…
Humble Debugger
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C++ date comparison does not always evaluate to the same logical value

I am making a project that has to keep track of dates associated with books. I store the dates as strings. I need to print out all books that were published after a given date. Below is a loop similar to what I do in my code which replicates a…
K. Shores
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How do I convert a Unix timestamp string to time_t in C++11?

Short question, aka "TD;DR". I have a, say, "1464478647000" string, that I guess is a UNIX timestamp. But surely it is a string containing a number that represents time, but not in a human readable format. How do I convert it to a time_t type so I…
acidrums4
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Convert `time_t` to decimal year in C++

How can I convert a time_t structure to years as decimal? For example, for a date 2015-07-18 00:00:00 I would like to get 2015.625.
SSV
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Time-server time type issue

so I'm writing a little time server-client application in C on linux that's supposed to send the current unix time stamp to the client. It works all fine and all, but I've been told that time_t might not always be the same size and byte order. How…
rfreytag
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Testing for leap seconds for a given time_t in Linux

Is there a simple way of determining how many (if any) leap seconds are applied for a given implementation of: time_t unix_seconds = mktime(&my_tm); For example, is there a field that is populated in my_tm? Otherwise, I suppose my option is test…
Damien
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Printing time in seconds

I am writing a program and attempting to time the number of seconds that passes when a given block of code runs. Afterwards I would like to print the total time it took to run the block of code in seconds. What I have written is: time_t start =…
raphnguyen
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How to convert the negative timestamp to a string. C++

I have the negative timestamp (that is date older 1970, e.g. 15.04.1896). How to convert the given timestamp to the correct date string. As I'm trying to do it #include #include #include int _tmain(int argc, _TCHAR*…
Artem Zubkov
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Checking if time_t is between other time_t with some margin of error

I have two time_t variables: timeA and timeB. What I want to do is check if timeA is the same as timeB. However, I know that in some cases they won't be exactly the same and there may be a 1 or 2 seconds difference between the two of them, so what I…
Alex
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Incorrect result after adding days to date

Using below function, which simply adds days to date (yyyymmdd), works fine throughout years. int dateplusdays(int datein, int days) { int year, month, day; int dateout; struct tm date; time_t secs; year = (int)floor(datein /…
geohei
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Comparing a time_t to a struct timespec (in C)

I have multiple struct timespec values and a time_t value. I want to see which struct timespec value is the closest to the time_t value. Should I just compare the seconds and ignore the nanoseconds? Or should I convert both to total nanoseconds…
jetset
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