Add date time utility functions

1 files changed, 89 insertions, 0 deletions

diff --git a/src/util/date-time.js b/src/util/date-time.js
new file mode 100644
index 00000000..f8a2ac45
--- /dev/null
+++ b/src/util/date-time.js
@@ -0,0 +1,89 @@
+/**
+ * Parses date-time string representations and returns a parsed object.
+ *
+ * The format assumed is "YYYY-MM-DDTHH:MM:SS".
+ *
+ * @param dateTimeString A string expressing a date and a time, in the above mentioned format.
+ * @returns {object} An object with the parsed date and time information as content.
+ */
+export function parseDateTime(dateTimeString) {
+    const output = {
+        year: 0,
+        month: 0,
+        day: 0,
+        hour: 0,
+        minute: 0,
+        second: 0
+    };
+
+    const dateAndTime = dateTimeString.split("T");
+    const dateComponents = dateAndTime[0].split("-");
+    output.year = parseInt(dateComponents[0]);
+    output.month = parseInt(dateComponents[1]);
+    output.day = parseInt(dateComponents[2]);
+
+    const timeComponents = dateAndTime[1].split(":");
+    output.hour = parseInt(timeComponents[0]);
+    output.minute = parseInt(timeComponents[1]);
+    output.second = parseInt(timeComponents[2]);
+
+    return output;
+}
+
+/**
+ * Serializes the given date and time value to a string.
+ *
+ * The format assumed is "YYYY-MM-DDTHH:MM:SS".
+ *
+ * @param dateTime An object representation of a date and time.
+ * @returns {string} A string representation of that date and time.
+ */
+export function formatDateTime(dateTime) {
+    let date;
+    const currentDate = new Date();
+
+    date = addPaddingToTwo(dateTime.day) + "/" +
+        addPaddingToTwo(dateTime.month) + "/" +
+        addPaddingToTwo(dateTime.year);
+
+    if (dateTime.year === currentDate.getFullYear() &&
+        dateTime.month === currentDate.getMonth() + 1) {
+        if (dateTime.day === currentDate.getDate()) {
+            date = "Today";
+        } else if (dateTime.day === currentDate.getDate() - 1) {
+            date = "Yesterday";
+        }
+    }
+
+    return date + ", " +
+        addPaddingToTwo(dateTime.hour) + ":" +
+        addPaddingToTwo(dateTime.minute);
+}
+
+/**
+ * Returns a string representation of the current date and time.
+ *
+ * The format assumed is "YYYY-MM-DDTHH:MM:SS".
+ *
+ * @returns {string} A string representation of the current date and time.
+ */
+export function getCurrentDateTime() {
+    const currentDate = new Date();
+    return currentDate.getFullYear() + "-" + addPaddingToTwo(currentDate.getMonth() + 1) + "-" +
+        addPaddingToTwo(currentDate.getDate()) + "T" + addPaddingToTwo(currentDate.getHours()) + ":" +
+        addPaddingToTwo(currentDate.getMinutes()) + ":" + addPaddingToTwo(currentDate.getSeconds());
+}
+
+/**
+ * Pads the given integer to have at least two digits.
+ *
+ * @param integer An integer to be padded.
+ * @returns {string} A string containing the padded integer
+ */
+export function addPaddingToTwo(integer) {
+    if (integer < 10) {
+        return "0" + integer.toString();
+    } else {
+        return integer.toString();
+    }
+}