How to get number of milliseconds from start of day

Question

For example, if it's 1 p.m (13:00) and I need to get the number 46800000 (13 hours from beginning o day) in milliseconds. Could anyone please help?

Based on *title* **and** *body* of the question, Toan Le is asking for the number of milliseconds since midnight. — 323go, Dec 01 '14 at 18:44

score 21 · Accepted Answer · answered Dec 01 '14 at 18:39

21

You can use a Calendar to calculate it. You set the time to the hour 0 and calculate the difference:

Calendar c = Calendar.getInstance();
c.set(Calendar.HOUR_OF_DAY, 0);
c.set(Calendar.MINUTE, 0);
c.set(Calendar.SECOND, 0);
c.set(Calendar.MILLISECOND, 0);
long millis = (System.currentTimeMillis() - c.getTimeInMillis());

answered Dec 01 '14 at 18:39

Marcos Lima

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Great answer! Should be helpful to 'em. – Bobby Dec 01 '14 at 18:49
Refer this: https://stackoverflow.com/questions/8826270/how-to-convert-hhmmss-sss-to-milliseconds – Rohit Jain May 17 '19 at 09:07
This answer is incorrect and doesn't answer OP's question for future readers – alfietap Feb 18 '22 at 18:02

score 0 · Answer 2 · answered Dec 01 '14 at 19:11

0

Joda-Time

Using the Joda-Time 2.5 library, it is an easy one-liner.

long millisOfDay = DateTime.now(  DateTimeZone.forID( "America/Montreal" ) ).getMillisOfDay();

Note how time zone is crucial. If omitted you implicitly rely on the JVM’s current default.

answered Dec 01 '14 at 19:11

Basil Bourque

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How to get number of milliseconds from start of day

2 Answers2

Joda-Time