Initial project commit

lib/nightscout/com/eveningoutpost/dexdrip/Models/DateUtil.java

@@ -0,0 +1,96 @@
+package com.eveningoutpost.dexdrip.Models;
+
+import java.text.DateFormat;
+import java.text.SimpleDateFormat;
+import java.util.Date;
+import java.util.Locale;
+import java.util.TimeZone;
+
+// from package info.nightscout.client.utils;
+
+/**
+ * Created by mike on 30.12.2015.
+ */
+
+/**
+ * The Class DateUtil. A simple wrapper around SimpleDateFormat to ease the handling of iso date string <-> date obj
+ * with TZ
+ */
+public class DateUtil {
+
+    private static final String FORMAT_DATE_ISO = "yyyy-MM-dd'T'HH:mm:ss'Z'"; // eg 2017-03-24T22:03:27Z
+    private static final String FORMAT_DATE_ISO2 = "yyyy-MM-dd'T'HH:mm:ssZ"; // eg 2017-03-27T17:38:14+0300
+    private static final String FORMAT_DATE_ISO3 = "yyyy-MM-dd'T'HH:mmZ"; // eg 2017-05-12T08:16-0400
+
+    /**
+     * Takes in an ISO date string of the following format:
+     * yyyy-mm-ddThh:mm:ss.ms+HoMo
+     *
+     * @param isoDateString the iso date string
+     * @return the date
+     * @throws Exception the exception
+     */
+    private static Date fromISODateString(String isoDateString)
+            throws Exception {
+        SimpleDateFormat f = new SimpleDateFormat(FORMAT_DATE_ISO);
+        f.setTimeZone(TimeZone.getTimeZone("UTC"));
+        return f.parse(isoDateString);
+    }
+
+    private static Date fromISODateString3(String isoDateString)
+            throws Exception {
+        SimpleDateFormat f = new SimpleDateFormat(FORMAT_DATE_ISO3);
+        f.setTimeZone(TimeZone.getTimeZone("UTC"));
+        return f.parse(isoDateString);
+    }
+
+    private static Date fromISODateString2(String isoDateString)
+            throws Exception {
+        try {
+            SimpleDateFormat f = new SimpleDateFormat(FORMAT_DATE_ISO2);
+            f.setTimeZone(TimeZone.getTimeZone("UTC"));
+            return f.parse(isoDateString);
+        } catch (java.text.ParseException e) {
+            return fromISODateString3(isoDateString);
+        }
+    }
+
+    public static Date tolerantFromISODateString(String isoDateString)
+            throws Exception {
+        try {
+            return fromISODateString(isoDateString.replaceFirst("\\.[0-9][0-9][0-9]Z$", "Z"));
+        } catch (java.text.ParseException e) {
+            return fromISODateString2(isoDateString);
+        }
+    }
+
+    /**
+     * Render date
+     *
+     * @param date   the date obj
+     * @param format - if not specified, will use FORMAT_DATE_ISO
+     * @param tz     - tz to set to, if not specified uses local timezone
+     * @return the iso-formatted date string
+     */
+    public static String toISOString(Date date, String format, TimeZone tz) {
+        if (format == null) format = FORMAT_DATE_ISO;
+        if (tz == null) tz = TimeZone.getDefault();
+        DateFormat f = new SimpleDateFormat(format);
+        f.setTimeZone(tz);
+        return f.format(date);
+    }
+
+    public static String toISOString(Date date) {
+        return toISOString(date, FORMAT_DATE_ISO, TimeZone.getTimeZone("UTC"));
+    }
+
+    public static String toISOString(long date) {
+        return toISOString(new Date(date), FORMAT_DATE_ISO, TimeZone.getTimeZone("UTC"));
+    }
+
+    public static String toNightscoutFormat(long date) {
+        final SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss.SSSZ", Locale.US);
+        format.setTimeZone(TimeZone.getDefault());
+        return format.format(date);
+    }
+}