1 files changed, 93 insertions, 0 deletions
diff --git a/opendc-web/opendc-web-ui/src/util/date-time.js b/opendc-web/opendc-web-ui/src/util/date-time.js
new file mode 100644
index 00000000..66efdf5b
--- /dev/null
+++ b/opendc-web/opendc-web-ui/src/util/date-time.js
@@ -0,0 +1,93 @@
+/**
+ * Parses and formats the given date-time string representation.
+ *
+ * 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 {string} A human-friendly string version of that date and time.
+ */
+export function parseAndFormatDateTime(dateTimeString) {
+    return formatDateTime(parseDateTime(dateTimeString))
+}
+
+/**
+ * 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} A Date object with the parsed date and time information as content.
+ */
+export function parseDateTime(dateTimeString) {
+    return new Date(dateTimeString + '.000Z')
+}
+
+/**
+ * Serializes the given date and time value to a human-friendly string.
+ *
+ * @param dateTime An object representation of a date and time.
+ * @returns {string} A human-friendly string version of that date and time.
+ */
+export function formatDateTime(dateTime) {
+    let date
+    const currentDate = new Date()
+
+    date =
+        addPaddingToTwo(dateTime.getDay()) +
+        '/' +
+        addPaddingToTwo(dateTime.getMonth()) +
+        '/' +
+        addPaddingToTwo(dateTime.getFullYear())
+
+    if (dateTime.getFullYear() === currentDate.getFullYear() && dateTime.getMonth() === currentDate.getMonth()) {
+        if (dateTime.getDate() === currentDate.getDate()) {
+            date = 'Today'
+        } else if (dateTime.getDate() === currentDate.getDate() - 1) {
+            date = 'Yesterday'
+        }
+    }
+
+    return date + ', ' + addPaddingToTwo(dateTime.getHours()) + ':' + addPaddingToTwo(dateTime.getMinutes())
+}
+
+/**
+ * Formats the given number of seconds/ticks to a formatted time representation.
+ *
+ * @param seconds The number of seconds.
+ * @returns {string} A string representation of that amount of second, in the from of HH:MM:SS.
+ */
+export function convertSecondsToFormattedTime(seconds) {
+    if (seconds <= 0) {
+        return '0s'
+    }
+
+    let hour = Math.floor(seconds / 3600)
+    let minute = Math.floor(seconds / 60) % 60
+    let second = seconds % 60
+
+    hour = isNaN(hour) ? 0 : hour
+    minute = isNaN(minute) ? 0 : minute
+    second = isNaN(second) ? 0 : second
+
+    if (hour === 0 && minute === 0) {
+        return second + 's'
+    } else if (hour === 0) {
+        return minute + 'm' + addPaddingToTwo(second) + 's'
+    } else {
+        return hour + 'h' + addPaddingToTwo(minute) + 'm' + addPaddingToTwo(second) + 's'
+    }
+}
+
+/**
+ * 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.
+ */
+function addPaddingToTwo(integer) {
+    if (integer < 10) {
+        return '0' + integer.toString()
+    } else {
+        return integer.toString()
+    }
+}