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dates.hh
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dates.hh
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// Copyright (C) 2007 Zack Weinberg <[email protected]>
//
// This program is made available under the GNU GPL version 2.0 or
// greater. See the accompanying file COPYING for details.
//
// This program is distributed WITHOUT ANY WARRANTY; without even the
// implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
// PURPOSE.
#ifndef DATES_HH
#define DATES_HH
// This file provides a straightforward wrapper class around the standard
// C time functions. Note that all operations are done in UTC, *not* the
// user's time zone.
#include "numeric_vocab.hh"
#include "sanity.hh"
struct date_t
{
// For the benefit of the --date option.
date_t() : d("") {}
bool valid() const { return d != ""; }
// Return the local system's idea of the current date.
static date_t now();
// Return the date corresponding to an unsigned 64-bit count of seconds
// since the Unix epoch (1970-01-01T00:00:00).
static date_t from_unix_epoch(u64);
// Return the date corresponding to a string. Presently this recognizes
// only ISO 8601 "basic" and "extended" time formats.
static date_t from_string(std::string const &);
// Write out date as a string.
std::string const & as_iso_8601_extended() const;
private:
// For what we do with dates, it is most convenient to store them as
// strings in the ISO 8601 extended time format.
std::string d;
// used by the above factory functions
date_t(std::string const & s) : d(s) {};
};
std::ostream & operator<< (std::ostream & o, date_t const & d);
template <> void dump(date_t const & d, std::string & s);
#endif // dates.hh
// Local Variables:
// mode: C++
// fill-column: 76
// c-file-style: "gnu"
// indent-tabs-mode: nil
// End:
// vim: et:sw=2:sts=2:ts=2:cino=>2s,{s,\:s,+s,t0,g0,^-2,e-2,n-2,p2s,(0,=s: