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AK: Add helper to convert an epoch time in seconds to a year

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Timothy Flynn 2022-01-18 17:05:21 -05:00 • committed by Linus Groh
parent bc719e7bac
commit e9e8e2bdf4
1 changed files with 10 additions and 0 deletions
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10
AK/Time.h
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@ -10,6 +10,7 @@
#include <AK/Assertions.h> #include <AK/Assertions.h>
#include <AK/Platform.h> #include <AK/Platform.h>
#include <AK/Types.h> #include <AK/Types.h>
#include <math.h>
// Kernel and Userspace pull in the definitions from different places. // Kernel and Userspace pull in the definitions from different places.
// Avoid trying to figure out which one. // Avoid trying to figure out which one.
@ -78,6 +79,14 @@ constexpr int days_since_epoch(int year, int month, int day)
return years_to_days_since_epoch(year) + day_of_year(year, month, day); return years_to_days_since_epoch(year) + day_of_year(year, month, day);
} }
constexpr i64 seconds_since_epoch_to_year(i64 seconds)
{
constexpr double seconds_per_year = 60.0 * 60.0 * 24.0 * 365.2425;
auto years_since_epoch = static_cast<double>(seconds) / seconds_per_year;
return 1970 + static_cast<i64>(floor(years_since_epoch));
}
/* /*
* Represents a time amount in a "safe" way. * Represents a time amount in a "safe" way.
* Minimum: 0 seconds, 0 nanoseconds * Minimum: 0 seconds, 0 nanoseconds
@ -338,6 +347,7 @@ using AK::days_in_month;
using AK::days_in_year; using AK::days_in_year;
using AK::days_since_epoch; using AK::days_since_epoch;
using AK::is_leap_year; using AK::is_leap_year;
using AK::seconds_since_epoch_to_year;
using AK::Time; using AK::Time;
using AK::timespec_add; using AK::timespec_add;
using AK::timespec_add_timeval; using AK::timespec_add_timeval;