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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,73 @@ | ||
| #include <cmath> | ||
| #include <ctime> | ||
| #include <iostream> | ||
| #include <iomanip> | ||
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|
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| #include "constants.h" | ||
|
|
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| namespace Utilities | ||
| { | ||
|
|
||
| double changeCompoundingBasis( | ||
| double rate, int origCompoundsPerYear, int newCompoundsPerYear) | ||
| { | ||
| return 1.0 - pow(1.0 - rate, float(origCompoundsPerYear) / float(newCompoundsPerYear)); | ||
| } | ||
|
|
||
| double calculatePayment(double balance, int amortTerm, double periodicRate) | ||
| { | ||
| if (amortTerm == 0) | ||
| { | ||
| return periodicRate * balance; | ||
| } | ||
| else | ||
| { | ||
| return balance * periodicRate / (1 - pow(1 + periodicRate, -amortTerm)); | ||
| } | ||
| } | ||
|
|
||
| namespace DateTime | ||
| { | ||
| struct tm createTime(int year, int month, int day) | ||
| { | ||
| struct tm date; | ||
| date.tm_hour = 0; | ||
| date.tm_min = 0; | ||
| date.tm_sec = 0; | ||
| date.tm_year = year - 1900; | ||
| date.tm_mon = month - 1; | ||
| date.tm_mday = day; | ||
| return date; | ||
| } | ||
|
|
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| struct tm addDateInterval(struct tm date, int years, int months, int days) | ||
| { | ||
| date.tm_year += years; | ||
| date.tm_mon += months; | ||
| date.tm_mday += days; | ||
| mktime(&date); | ||
| return date; | ||
| } | ||
|
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||
| int toYYYYMMDD(struct tm date) | ||
| { | ||
| char date_YYYYMMDD[9]; | ||
| strftime(date_YYYYMMDD, 9, "%Y%m%d", &date); | ||
| return std::stoi(date_YYYYMMDD); | ||
| } | ||
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| int daysBetween(struct tm date1, struct tm date2, bool inclusiveEnd = true) | ||
| { | ||
| int secondsBetween = std::difftime(mktime(&date2), mktime(&date1)); | ||
| return int(secondsBetween / 60.0 / 60.0 / 24.0) + (inclusiveEnd ? 1 : 0); | ||
| } | ||
|
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| int monthsBetween(struct tm date1, struct tm date2) | ||
| { | ||
| // Ignores the day of month | ||
| return (date2.tm_year - date1.tm_year) * 12 + date2.tm_mon - date1.tm_mon; | ||
| } | ||
|
|
||
| } // namespace DateTime | ||
|
|
||
| } // namespace Utilities |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,31 @@ | ||
| #include "catch.hpp" | ||
| #include "utilities.h" | ||
|
|
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| using namespace Utilities::DateTime; | ||
|
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| TEST_CASE("Check date difference in months matches expected value") | ||
| { | ||
| auto date1 = createTime(2019, 1, 1); | ||
| auto date2 = createTime(2019, 9, 1); | ||
| auto date3 = createTime(2020, 3, 1); | ||
|
|
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| REQUIRE(monthsBetween(date1, date1) == 0); | ||
| REQUIRE(monthsBetween(date1, date2) == 8); | ||
| REQUIRE(monthsBetween(date1, date3) == 14); | ||
| REQUIRE(monthsBetween(date2, date3) == 6); | ||
| REQUIRE(monthsBetween(date2, date1) == -8); | ||
| REQUIRE(monthsBetween(date3, date1) == -14); | ||
| REQUIRE(monthsBetween(date3, date2) == -6); | ||
| } | ||
|
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| TEST_CASE("Check date difference in days matches expected value") | ||
| { | ||
| auto date1 = createTime(2019, 1, 1); | ||
| auto date2 = createTime(2019, 3, 1); | ||
| auto date3 = createTime(2031, 6, 1); | ||
|
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| REQUIRE(daysBetween(date1, date1, false) == 0); | ||
| REQUIRE(daysBetween(date1, date2, false) == 59); | ||
| REQUIRE(daysBetween(date1, date2, true) == 60); | ||
| REQUIRE(daysBetween(date1, date3, false) == 4534); | ||
| } |