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#include "datetime.h"
#include <yql/essentials/minikql/mkql_type_ops.h>
namespace NYql::DateTime {
bool DoAddMonths(TTMStorage& storage, i64 months, const NUdf::IDateBuilder& builder) {
i64 newMonth = months + storage.Month;
storage.Year += (newMonth - 1) / 12;
newMonth = 1 + (newMonth - 1) % 12;
if (newMonth <= 0) {
storage.Year--;
newMonth += 12;
}
storage.Month = newMonth;
bool isLeap = NKikimr::NMiniKQL::IsLeapYear(storage.Year);
ui32 monthLength = NKikimr::NMiniKQL::GetMonthLength(storage.Month, isLeap);
storage.Day = std::min(monthLength, storage.Day);
return storage.Validate(builder);
}
bool DoAddYears(TTMStorage& storage, i64 years, const NUdf::IDateBuilder& builder) {
storage.Year += years;
if (storage.Month == 2 && storage.Day == 29) {
bool isLeap = NKikimr::NMiniKQL::IsLeapYear(storage.Year);
if (!isLeap) {
storage.Day--;
}
}
return storage.Validate(builder);
}
TInstant DoAddMonths(TInstant current, i64 months, const NUdf::IDateBuilder& builder) {
TTMStorage storage;
storage.FromTimestamp(builder, current.GetValue());
if (!DoAddMonths(storage, months, builder)) {
ythrow yexception() << "Shift error " << current.ToIsoStringLocal() << " by " << months << " months";
}
return TInstant::FromValue(storage.ToTimestamp(builder));
}
TInstant DoAddYears(TInstant current, i64 years, const NUdf::IDateBuilder& builder) {
TTMStorage storage;
storage.FromTimestamp(builder, current.GetValue());
if (!DoAddYears(storage, years, builder)) {
ythrow yexception() << "Shift error " << current.ToIsoStringLocal() << " by " << years << " years";
}
return TInstant::FromValue(storage.ToTimestamp(builder));
}
}
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