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diff --git a/dev/a3-earthquake/date.cc b/dev/a3-earthquake/date.cc
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+++ b/dev/a3-earthquake/date.cc
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+/** CSci-4611 Assignment 3:  Earthquake
+ */
+
+#include <ctime>
+#include "date.h"
+
+using namespace std;
+
+const int SECONDS_PER_4_YEARS=126230400;
+
+Date::Date() {
+    year_ = 0;
+    month_ = 0;
+    day_ = 0;
+    hour_ = 0;
+    minute_ = 0;
+    second_ = 0;
+    ctime_ = 0;
+    fouryears_ = 0;
+}
+
+// for visual studio, disable warning about localtime being unsafe
+#pragma warning(push)
+#pragma warning(disable: 4996)
+
+Date::Date(double seconds) {
+    double tweakedSeconds = seconds;
+    fouryears_ = 0;
+    while (tweakedSeconds < 0) {
+        tweakedSeconds += SECONDS_PER_4_YEARS;
+        fouryears_++;
+    }
+    ctime_ = int(tweakedSeconds);
+    tm *t;
+    t = localtime(&ctime_);
+    year_ = t->tm_year + 1900 - 4 * fouryears_;
+    month_ = t->tm_mon + 1;
+    day_ = t->tm_mday;
+    hour_ = t->tm_hour;
+    minute_ = t->tm_min;
+    second_ = t->tm_sec + (tweakedSeconds - ctime_);
+}
+
+#pragma warning(pop)
+
+Date::Date(int m, int d, int y) {
+    month_ = m;
+    day_ = d;
+    year_ = y;
+    hour_ = 0;
+    minute_ = 0;
+    second_ = 0;
+    fouryears_ = 0;
+    tm t;
+    while (year_ + fouryears_*4 < 1970) {
+        fouryears_++;
+    }
+    t.tm_year = year_ - 1900 + fouryears_ * 4;
+    t.tm_mon = month_ - 1;
+    t.tm_mday = day_;
+    t.tm_hour = 0;
+    t.tm_min = 0;
+    t.tm_sec = 0;
+    ctime_ = mktime(&t);
+}
+
+Date::Date(int m, int d, int y, int hr, int min, double sec) {
+    month_ = m;
+    day_ = d;
+    year_ = y;
+    hour_ = hr;
+    minute_ = min;
+    second_ = sec;
+    fouryears_ = 0;
+    tm t;
+    while (year_ + fouryears_*4 < 1970) {
+        fouryears_++;
+    }
+    t.tm_year = year_ - 1900 + fouryears_ * 4;
+    t.tm_mon = month_ - 1;
+    t.tm_mday = day_;
+    t.tm_hour = hour_;
+    t.tm_min = minute_;
+    t.tm_sec = int(second_);
+    ctime_ = mktime(&t);
+}
+
+bool Date::operator<(const Date& other) {
+    return ToSeconds() < other.ToSeconds();
+}
+
+bool Date::operator>(const Date& other) {
+    return ToSeconds() > other.ToSeconds();
+}
+
+double Date::ToSeconds() const {
+    return ctime_ + second_ - int(second_) - double(fouryears_) * SECONDS_PER_4_YEARS;
+}
+
+double Date::SecondsUntil(const Date& other) const {
+    return ToSeconds() - other.ToSeconds();
+}
+
+
+int Date::year() {
+    return year_;
+}
+
+int Date::month() {
+    return month_;
+}
+
+int Date::day() {
+    return day_;
+}
+
+int Date::hour() {
+    return hour_;
+}
+
+int Date::minute() {
+    return minute_;
+}
+
+double Date::second() {
+    return second_;
+}