Let's say I have time_t and tm structure. I can't use Boost but MFC. How can I make it a string like following?
Mon Apr 23 17:48:14 2012
Is using sprintf the only way?
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2Boost.DateTime has formatted I/O facilities.ildjarn– ildjarn2012-04-23 22:10:58 +00:00Commented Apr 23, 2012 at 22:10
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With a sentence or two more, that could be a (the?) answer, @ildjarnJasper– Jasper2012-04-23 22:11:48 +00:00Commented Apr 23, 2012 at 22:11
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2@Jasper : While I use the library, I find recommending it to other people difficult because the documentation is so horrible. I just left a comment so the OP could pursue that on their own if they choose (e.g. there are plenty of SO answers demonstrating exactly this, such as this one).ildjarn– ildjarn2012-04-23 22:12:59 +00:00Commented Apr 23, 2012 at 22:12
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6 Answers
The C library includes strftime specifically for formatting dates/times. The format you're asking for seems to correspond to something like this:
char buffer[256];
strftime(buffer, sizeof(buffer), "%a %b %d %H:%M:%S %Y", &your_tm);
I believe std::put_time uses a similar format string, though it does relieve you of having to explicitly deal with a buffer. If you want to write the output to a stream, it's quite convenient, but to get it into a string it's not a lot of help -- you'd have to do something like:
std::stringstream buffer;
buffer << std::put_time(&your_tm, "%a %b %d %H:%M:%S %Y");
// now the result is in `buffer.str()`.
std::put_time is new with C++11, but C++03 has a time_put facet in a locale that can do the same thing. If memory serves, I did manage to make it work once, but after that decided it wasn't worth the trouble, and I haven't done it since.
2 Comments
Benjamin Gruenbaum
Just wanted to note gcc still lacks support for put_time :/
Louis Go
It's done on GCC 5. Ref: stackoverflow.com/a/14137287/4123703
I'd try std::put_time. See the link here for information on how to use it. It supports full format strings and such.
ctime() produces strings in that format. It takes a pointer to a time_t.
There's also asctime() that takes a pointer to a struct tm and does the same.
1 Comment
parasrish
ctime(&curtime), where time_t curtime; reference: tutorialspoint.com/c_standard_library/c_function_ctime.htmIf you need to worry about formatting on different locales, don't forget to initialize the CRT with the current locale. This affects COleDateTime too.
setlocale(LC_COLLATE,“.OCP”); // sets the sort order
setlocale(LC_MONETARY, “.OCP”); // sets the currency formatting rules
setlocale(LC_NUMERIC, “.OCP”); // sets the formatting of numerals
setlocale(LC_TIME, “.OCP”); // defines the date/time formatting
See my blog post which ties in MSDN articles and other sources. http://gilesey.wordpress.com/2012/12/30/initailizing-mfccrt-for-consumption-of-regional-settings-internationalizationc
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MFC has COleDateTime which has a contructor that takes time_t (or __time64_t) and has a Format method.
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CTime obj1(time_tObj);
CString s = obj1.Format( "%a %b %d %H:%M:%S %Y" );
