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Duration: support negative durations by prefixing a '-' before the P in ISO format #111

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Duration: support negative durations by prefixing a '-' before the P in ISO format #111

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5df98cb
Duration: support negative durations by prefixing a '-' before the P …
apoelstra Dec 27, 2025
b76e66e
Duration: update other format methods to support negative dates
apoelstra Dec 27, 2025
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60 changes: 44 additions & 16 deletions src/Duration.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -217,25 +217,28 @@ bool Duration::parse_designated (Pig& pig)
{
auto checkpoint = pig.cursor ();

// sign = -1 if a '-' is present, else 1
int sign = !pig.skip ('-') * 2 - 1;

if (pig.skip ('P') &&
! pig.eos ())
{
long long value;
pig.save ();
if (pig.getDigits (value) && pig.skip ('Y'))
_year = value;
_year = sign * value;
else
pig.restore ();

pig.save ();
if (pig.getDigits (value) && pig.skip ('M'))
_month = value;
_month = sign * value;
else
pig.restore ();

pig.save ();
if (pig.getDigits (value) && pig.skip ('D'))
_day = value;
_day = sign * value;
else
pig.restore ();

Expand All @@ -244,19 +247,19 @@ bool Duration::parse_designated (Pig& pig)
{
pig.save ();
if (pig.getDigits (value) && pig.skip ('H'))
_hours = value;
_hours = sign * value;
else
pig.restore ();

pig.save ();
if (pig.getDigits (value) && pig.skip ('M'))
_minutes = value;
_minutes = sign * value;
else
pig.restore ();

pig.save ();
if (pig.getDigits (value) && pig.skip ('S'))
_seconds = value;
_seconds = sign * value;
else
pig.restore ();
}
Expand Down Expand Up @@ -400,12 +403,18 @@ std::string Duration::format () const
if (_period)
{
time_t t = _period;

std::stringstream s;
if (t < 0) {
s << '-';
t *= -1;
}

int seconds = t % 60; t /= 60;
int minutes = t % 60; t /= 60;
int hours = t % 24; t /= 24;
int days = t;

std::stringstream s;
if (days)
s << days << "d ";

Expand All @@ -429,11 +438,17 @@ std::string Duration::formatHours () const
if (_period)
{
time_t t = _period;

std::stringstream s;
if (t < 0) {
s << '-';
t *= -1;
}

int seconds = t % 60; t /= 60;
int minutes = t % 60; t /= 60;
int hours = t;

std::stringstream s;
s << hours
<< ':'
<< std::setw (2) << std::setfill ('0') << minutes
Expand All @@ -454,12 +469,18 @@ std::string Duration::formatISO () const
if (_period)
{
time_t t = _period;

std::stringstream s;
if (t < 0) {
s << '-';
t *= -1;
}

int seconds = t % 60; t /= 60;
int minutes = t % 60; t /= 60;
int hours = t % 24; t /= 24;
int days = t;

std::stringstream s;
s << 'P';
if (days) s << days << 'D';

Expand Down Expand Up @@ -492,16 +513,23 @@ std::string Duration::formatISO () const
//
std::string Duration::formatVague (bool padding) const
{
time_t t = _period;
float days = (float) _period / 86400.0;

std::stringstream formatted;
if (_period >= 86400 * 365) formatted << std::fixed << std::setprecision (1) << (days / 365) << (padding ? "y " : "y");
else if (_period >= 86400 * 90) formatted << static_cast <int> (days / 30) << (padding ? "mo " : "mo");
else if (_period >= 86400 * 14) formatted << static_cast <int> (days / 7) << (padding ? "w " : "w");
else if (_period >= 86400) formatted << static_cast <int> (days) << (padding ? "d " : "d");
else if (_period >= 3600) formatted << static_cast <int> (_period / 3600) << (padding ? "h " : "h");
else if (_period >= 60) formatted << static_cast <int> (_period / 60) << "min"; // Longest suffix - no padding
else if (_period >= 1) formatted << static_cast <int> (_period) << (padding ? "s " : "s");
if (t < 0) {
formatted << '-';
t *= -1;
days *= -1.0;
}

if (t >= 86400 * 365) formatted << std::fixed << std::setprecision (1) << (days / 365) << (padding ? "y " : "y");
else if (t >= 86400 * 90) formatted << static_cast <int> (days / 30) << (padding ? "mo " : "mo");
else if (t >= 86400 * 14) formatted << static_cast <int> (days / 7) << (padding ? "w " : "w");
else if (t >= 86400) formatted << static_cast <int> (days) << (padding ? "d " : "d");
else if (t >= 3600) formatted << static_cast <int> (t / 3600) << (padding ? "h " : "h");
else if (t >= 60) formatted << static_cast <int> (t / 60) << "min"; // Longest suffix - no padding
else if (t >= 1) formatted << static_cast <int> (t) << (padding ? "s " : "s");

return formatted.str ();
}
Expand Down