Get date-time in seconds from current date

Question

Need to get date-time in seconds from current date. Want to add 2 days from current date-time and get value of 7 PM of result day.

I.E. Current date-time is 1 January, 7:05 PM OR 6:55 PM, I should get value of 3 January, 7:00 PM in seconds.

P.S. - Can't use JODA Time & Java 8.

Possible duplicate of [Get date representation in seconds?](https://stackoverflow.com/questions/11106532/get-date-representation-in-seconds) — Kaustubh Khare, Jun 13 '18 at 06:48
yes, tried joda-time but can't use it. Need to have solution using Date / Calendar object of java — Mihir Patel, Jun 13 '18 at 06:48
@KaustubhKhare apart from getting value in seconds, I want the value of it at 7 PM of a particular date. — Mihir Patel, Jun 13 '18 at 06:51
Why would you use `Date` and `Calendar`? This is like asking for directions, then specifying that you have to go on a horse. — Dawood ibn Kareem, Jun 13 '18 at 06:55
@MihirPatel I am getting 02 January, 12:35 AM when parsing 1 January, 7:05 PM? is it correct — Harsh Jain, Jun 13 '18 at 07:15

score 3 · Answer 1 · answered Jun 13 '18 at 07:29

3

Did you try ThreeTenABP by Jake Wharton? https://github.com/JakeWharton/ThreeTenABP. You can use it also for android versions before api 26 (required for the new java.time.instant) and it has all the functionalities of the Java 8 api.

I would do:

LocalDate myDate;
myDate = LocalDate.now().plus(2, ChronoUnit.DAYS);
LocalDateTime myDateAtTime = myDate.atTime(19,0,0);
long millis = myDateAtTime.toEpochSecond(ZoneOffset.UTC);

answered Jun 13 '18 at 07:29

Nicola Gallazzi

7,897
6
45
64

1

Thank you for letting us know about this. +1 – gil.fernandes Jun 13 '18 at 07:37
1

Or if you prefer: `LocalDate.now().plusDays(2)`. Or `LocalDate.now(ZoneId.systemDefault()).plusDays(2)` to tell the reader we have chosen the device time zone consciously. May also want the same time zone for `now` and for `toEpochSecond`. – Ole V.V. Jun 13 '18 at 09:06

score 2 · Answer 2 · answered Jun 13 '18 at 06:58

Without using Java 8 you can do something like this:

public static void main(String[] args) throws Throwable {
    Calendar c = Calendar.getInstance();
    c.add(Calendar.DAY_OF_YEAR, 2);
    c.set(Calendar.HOUR_OF_DAY, 19);
    c.set(Calendar.MINUTE, 0);
    c.set(Calendar.SECOND, 0);
    c.set(Calendar.MILLISECOND, 0);
    System.out.println(c.getTimeInMillis() / 1000L); // Time in seconds in two days at 7:00 pm
}

You could also create a static method for this:

private static long timeInTwoDaysAt7pm() {
    Calendar c = Calendar.getInstance();
    c.add(Calendar.DAY_OF_YEAR, 2);
    c.set(Calendar.HOUR_OF_DAY, 19);
    c.set(Calendar.MINUTE, 0);
    c.set(Calendar.SECOND, 0);
    c.set(Calendar.MILLISECOND, 0);
    return c.getTimeInMillis() / 1000L;
}

olikaf · Answer 3 · 2018-06-13T12:11:55.083

1

If java 8 is a no go, then you can use Calendar :

import java.util.Calendar

Calendar calendar = Calendar.getInstance();

calendar.add(Calendar.DAY_OF_YEAR,  2);
calendar.set(Calendar.HOUR_OF_DAY, 19);
calendar.set(Calendar.MINUTE, 0);
calendar.set(Calendar.SECOND, 0);

edited Jun 13 '18 at 12:11

answered Jun 13 '18 at 06:58

olikaf

591
3
11

You're right ! I made some changes. Use add instead of set & set min and sec to 0 – olikaf Jun 13 '18 at 12:12

score 0 · Answer 4 · answered Jun 13 '18 at 07:01

0

Not sure if this is a correct approach or any better solution is there.

    Date dt = new Date();
    Calendar c = Calendar.getInstance();
    c.setTime(dt);
    c.add(Calendar.DATE, 2);
    c.set(Calendar.HOUR_OF_DAY, 19);
    c.set(Calendar.MINUTE, 0);
    c.set(Calendar.SECOND, 0);
    c.set(Calendar.MILLISECOND, 0);
    long timeInSeconds = c.getTime().getTime() / 100;

answered Jun 13 '18 at 07:01

Mihir Patel

456
7
20

Note: the time in seconds should be milliseconds divided by 1000 and not 100. 1000 milliseconds is one second after all. – gil.fernandes Jun 13 '18 at 07:33
You don't need the first and third lines. Other than that, this looks identical to gil.fernandes' answer. – Dawood ibn Kareem Jun 13 '18 at 09:57
thanks for your input, will exclude first and third lines. Is is correct other than that ? @DawoodibnKareem – Mihir Patel Jun 13 '18 at 10:05
Well, since it's almost an exact duplicate of someone else's answer, yeah, it's correct. Apart from dividing by 100 on the last line, which should be 1000. – Dawood ibn Kareem Jun 13 '18 at 10:06

Get date-time in seconds from current date

4 Answers4