Time Utility Class i'm using for one of my Android Project
import android.content.Context;
import android.text.TextUtils;
import android.text.format.DateUtils;
import java.text.DateFormat;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.*;
/**
* Modified from Google I/O Schedule App - https://github.com/google/iosched
* Original Code : https://github.com/google/iosched/blob/0a90bf8e6b90e9226f8c15b34eb7b1e4bf6d632e/android/src/main/java/com/google/samples/apps/iosched/util/TimeUtils.java
*/
public class TimeUtils {
private static final int SECOND = 1000;
private static final int MINUTE = 60 * SECOND;
private static final int HOUR = 60 * MINUTE;
private static final int DAY = 24 * HOUR;
public static String getCurrentUTCTimestamp() {
SimpleDateFormat dateFormatGmt = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss a Z", Locale.US);
dateFormatGmt.setTimeZone(TimeZone.getTimeZone("UTC"));
return dateFormatGmt.format(new Date());
}
public static String getUTCTimestamp(Date date) {
SimpleDateFormat dateFormatGmt = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss a Z", Locale.US);
dateFormatGmt.setTimeZone(TimeZone.getTimeZone("UTC"));
return dateFormatGmt.format(date);
}
public static String getTimeAgo(final Context context, long time) {
// TODO: use DateUtils methods instead
if (time < 1000000000000L) {
// if timestamp given in seconds, convert to millis
time *= 1000;
}
long now = System.currentTimeMillis();
if (time > now || time <= 0) {
return null;
}
final long diff = now - time;
// TODO: localize the time information
if (diff < MINUTE) {
return "just now";
} else if (diff < 2 * MINUTE) {
return "a minute ago";
} else if (diff < 50 * MINUTE) {
return diff / MINUTE + " minutes ago";
} else if (diff < 90 * MINUTE) {
return "an hour ago";
} else if (diff < 24 * HOUR) {
return diff / HOUR + " hours ago";
} else if (diff < 48 * HOUR) {
return "yesterday";
} else {
return diff / DAY + " days ago";
}
}
private static final SimpleDateFormat[] ACCEPTED_TIMESTAMP_FORMATS = {
new SimpleDateFormat("EEE, dd MMM yyyy HH:mm:ss Z", Locale.US),
new SimpleDateFormat("EEE MMM dd HH:mm:ss yyyy", Locale.US),
new SimpleDateFormat("yyyy-MM-dd HH:mm:ss", Locale.US),
new SimpleDateFormat("yyyy-MM-dd HH:mm:ss Z", Locale.US),
new SimpleDateFormat("yyyy-MM-dd HH:mm:ss a Z", Locale.US),
new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ssZ", Locale.US),
new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss'Z'", Locale.US),
new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss Z", Locale.US)
};
private static final SimpleDateFormat VALID_IFMODIFIEDSINCE_FORMAT =
new SimpleDateFormat("EEE, dd MMM yyyy HH:mm:ss Z", Locale.US);
public static Date parseTimestamp(String timestamp) {
for (SimpleDateFormat format : ACCEPTED_TIMESTAMP_FORMATS) {
// format.setTimeZone(TimeZone.getTimeZone("GMT"));
format.setTimeZone(TimeZone.getDefault());
try {
return format.parse(timestamp);
} catch (ParseException ex) {
continue;
}
}
// All attempts to parse have failed
return null;
}
public static boolean isValidFormatForIfModifiedSinceHeader(String timestamp) {
try {
return VALID_IFMODIFIEDSINCE_FORMAT.parse(timestamp)!=null;
} catch (Exception ex) {
return false;
}
}
public static long timestampToMillis(String timestamp, long defaultValue) {
if (TextUtils.isEmpty(timestamp)) {
return defaultValue;
}
Date d = parseTimestamp(timestamp);
return d == null ? defaultValue : d.getTime();
}
public static String formatShortDate(Context context, Date date) {
StringBuilder sb = new StringBuilder();
Formatter formatter = new Formatter(sb);
return DateUtils.formatDateRange(context, formatter, date.getTime(), date.getTime(),
DateUtils.FORMAT_ABBREV_ALL | DateUtils.FORMAT_NO_YEAR,
TimeZone.getDefault().getID()).toString();
}
public static String formatShortTime(Context context, Date time) {
DateFormat format = DateFormat.getTimeInstance(DateFormat.SHORT);
TimeZone tz = TimeZone.getDefault();
if (tz != null) {
format.setTimeZone(tz);
}
return format.format(time);
}
/**
* Returns "Today", "Tomorrow", "Yesterday", or a short date format.
*/
public static String formatHumanFriendlyShortDate(final Context context, long timestamp) {
long localTimestamp, localTime;
long now = System.currentTimeMillis();
TimeZone tz = TimeZone.getDefault();
localTimestamp = timestamp + tz.getOffset(timestamp);
localTime = now + tz.getOffset(now);
long dayOrd = localTimestamp / 86400000L;
long nowOrd = localTime / 86400000L;
if (dayOrd == nowOrd) {
return context.getString(R.string.day_title_today);
} else if (dayOrd == nowOrd - 1) {
return context.getString(R.string.day_title_yesterday);
} else if (dayOrd == nowOrd + 1) {
return context.getString(R.string.day_title_tomorrow);
} else {
return formatShortDate(context, new Date(timestamp));
}
}
}