CODEWITHSUNDEEP
c++boosttime
Grigor Gevorgyan
Grigor Gevorgyan

Reputation: 6853

How to convert boost::gregorian::date to mm/dd/yyyy format and vice versa?

Boost has several functions converting to other string formats described here, but there is no conversion into the necessary mm/dd/yyyy format. Currently I am doing it the following way:

 std::string dateAsMMDDYYYY( const boost::gregorian::date& date )
 {
    std::string yyyymmdd = boost::gregorian::to_iso_string( date );
    std::string ret = yyyymmdd.substr(4,2) + "/" + yyyymmdd.substr(6,2) + "/" + yyyymmdd.substr(0,4);
    return ret;
 }

i.e. just cutting the numbers out of the value returned by to_iso_string(). This seems very rude, and I am looking for a more elegant way to perform this conversion. Also I need an advice about how to perform a backward conversion (i.e. from 'mm/dd/yyyy' string to boost::gregorian::date)

Any help is appreciated. Thanks in advance.

Upvotes: 0

Views: 11890

Answers (3)

bjackfly
bjackfly

Reputation: 3336

 boost::gregorian::date d(boost::gregorian::day_clock::local_day());
  char date[10];
  sprintf ( date, "%d/%d/%d", static_cast<short>(d.month()), static_cast<short>(d.day()), static_cast<short>(d.year()) );

Upvotes: 3

Cubbi
Cubbi

Reputation: 47418

boost has fairly versatile date/time IO facilities

const std::locale fmt(std::locale::classic(),
                      new boost::gregorian::date_facet("%m/%d/%Y"));
std::string dateAsMMDDYYYY( const boost::gregorian::date& date )
{
    std::ostringstream os;
    os.imbue(fmt);
    os << date;
    return os.str();
}

Inverse conversion:

const std::locale fmt2(std::locale::classic(),
                       new boost::gregorian::date_input_facet("%m/%d/%Y"));
boost::gregorian::date MMDDYYYYasDate( const std::string& str)
{
    std::istringstream is(str);
    is.imbue(fmt2);
    boost::gregorian::date date;
    is >> date;
    return date;
}

Upvotes: 11

sim642
sim642

Reputation: 769

A better option would be to use a std::stringstream and output the date's month, day and year numbers separately and adding slashes between yourself.

Upvotes: 1

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