LP1904036 Angular date utility class

Including functions for intervalToSeconds, localDateFromYmd, and
localYmdFromDate.

Signed-off-by: Bill Erickson <berickxx@gmail.com>
Signed-off-by: Jane Sandberg <js7389@princeton.edu>

diff --git a/Open-ILS/src/eg2/src/app/share/util/date.ts b/Open-ILS/src/eg2/src/app/share/util/date.ts
new file mode 100644 (file)
index 0000000..bca1596
--- /dev/null
+++ b/Open-ILS/src/eg2/src/app/share/util/date.ts
@@ -0,0 +1,70 @@
+
+/* Utility code for dates */
+
+export class DateUtil {
+
+    /**
+     * Converts an interval string to seconds.
+     *
+     * intervalToSeconds('1 min 2 seconds')) => 62
+     * intervalToSeconds('2 days')) => 172800 (except across time changes)
+     * intervalToSeconds('02:00:23')) => 7223
+     */
+    static intervalToSeconds(interval: string): number {
+        const d = new Date();
+        const start = d.getTime();
+        const parts = interval.split(' ');
+
+        for (let i = 0; i < parts.length; i += 2)  {
+
+            if (!parts[i + 1]) {
+                // interval is a bare hour:min:sec string
+                const times = parts[i].split(':');
+                d.setHours(d.getHours() + Number(times[0]));
+                d.setMinutes(d.getMinutes() + Number(times[1]));
+                d.setSeconds(d.getSeconds() + Number(times[2]));
+                continue;
+            }
+
+            const count = Number(parts[i]);
+            const partType = parts[i + 1].replace(/s?,?$/, '');
+
+            if (partType.match(/^s/)) {
+                d.setSeconds(d.getSeconds() + count);
+            } else if (partType.match(/^min/)) {
+                d.setMinutes(d.getMinutes() + count);
+            } else if (partType.match(/^h/)) {
+                d.setHours(d.getHours() + count);
+            } else if (partType.match(/^d/)) {
+                d.setDate(d.getDate() + count);
+            } else if (partType.match(/^mon/)) {
+                d.setMonth(d.getMonth() + count);
+            } else if (partType.match(/^y/)) {
+                d.setFullYear(d.getFullYear() + count);
+            }
+        }
+
+        return Number((d.getTime() - start) / 1000);
+    }
+
+    // Create a date in the local time zone with selected YMD values.
+    // Note that new Date(ymd) produces a date in UTC.  This version
+    // produces a date in the local time zone.
+    static localDateFromYmd(ymd: string): Date {
+        const parts = ymd.split('-');
+        return new Date(
+            Number(parts[0]), Number(parts[1]) - 1, Number(parts[2]));
+    }
+
+    // Note that date.toISOString() produces a UTC date, which can have
+    // a different YMD value than a date in the local time zone.
+    // This variation returns values for the local time zone.
+    // Defaults to 'now' if no date is provided.
+    static localYmdFromDate(date?: Date): string {
+        const now = date || new Date();
+        return now.getFullYear() + '-' +
+            ((now.getMonth() + 1) + '').padStart(2, '0') + '-' +
+            (now.getDate() + '').padStart(2, '0');
+    }
+}
+