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AK: Add helper to convert an epoch time in seconds to a year
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AK/Time.h
10
AK/Time.h
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@ -10,6 +10,7 @@
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#include <AK/Assertions.h>
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#include <AK/Platform.h>
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#include <AK/Types.h>
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#include <math.h>
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// Kernel and Userspace pull in the definitions from different places.
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// Avoid trying to figure out which one.
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@ -78,6 +79,14 @@ constexpr int days_since_epoch(int year, int month, int day)
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return years_to_days_since_epoch(year) + day_of_year(year, month, day);
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}
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constexpr i64 seconds_since_epoch_to_year(i64 seconds)
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{
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constexpr double seconds_per_year = 60.0 * 60.0 * 24.0 * 365.2425;
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auto years_since_epoch = static_cast<double>(seconds) / seconds_per_year;
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return 1970 + static_cast<i64>(floor(years_since_epoch));
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}
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/*
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* Represents a time amount in a "safe" way.
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* Minimum: 0 seconds, 0 nanoseconds
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@ -338,6 +347,7 @@ using AK::days_in_month;
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using AK::days_in_year;
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using AK::days_since_epoch;
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using AK::is_leap_year;
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using AK::seconds_since_epoch_to_year;
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using AK::Time;
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using AK::timespec_add;
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using AK::timespec_add_timeval;
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