ESM: Ported DateTime operations

src/core/operations/ToUNIXTimestamp.mjs

@@ -0,0 +1,74 @@
+/**
+ * @author n1474335 [n1474335@gmail.com]
+ * @copyright Crown Copyright 2016
+ * @license Apache-2.0
+ */
+
+import Operation from "../Operation";
+import moment from "moment-timezone";
+import {UNITS} from "../lib/DateTime";
+
+/**
+ * To UNIX Timestamp operation
+ */
+class ToUNIXTimestamp extends Operation {
+
+    /**
+     * ToUNIXTimestamp constructor
+     */
+    constructor() {
+        super();
+
+        this.name = "To UNIX Timestamp";
+        this.module = "Default";
+        this.description = "Parses a datetime string in UTC and returns the corresponding UNIX timestamp.<br><br>e.g. <code>Mon 1 January 2001 11:00:00</code> becomes <code>978346800</code><br><br>A UNIX timestamp is a 32-bit value representing the number of seconds since January 1, 1970 UTC (the UNIX epoch).";
+        this.inputType = "string";
+        this.outputType = "string";
+        this.args = [
+            {
+                "name": "Units",
+                "type": "option",
+                "value": UNITS
+            },
+            {
+                "name": "Treat as UTC",
+                "type": "boolean",
+                "value": true
+            },
+            {
+                "name": "Show parsed datetime",
+                "type": "boolean",
+                "value": true
+            }
+        ];
+    }
+
+    /**
+     * @param {string} input
+     * @param {Object[]} args
+     * @returns {string}
+     */
+    run(input, args) {
+        const [units, treatAsUTC, showDateTime] = args,
+            d = treatAsUTC ? moment.utc(input) : moment(input);
+
+        let result = "";
+
+        if (units === "Seconds (s)") {
+            result = d.unix();
+        } else if (units === "Milliseconds (ms)") {
+            result = d.valueOf();
+        } else if (units === "Microseconds (μs)") {
+            result = d.valueOf() * 1000;
+        } else if (units === "Nanoseconds (ns)") {
+            result = d.valueOf() * 1000000;
+        } else {
+            throw "Unrecognised unit";
+        }
+
+        return showDateTime ? `${result} (${d.tz("UTC").format("ddd D MMMM YYYY HH:mm:ss")} UTC)` : result.toString();
+    }
+
+}
+
+export default ToUNIXTimestamp;