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I want one word that means Date and Time. For example in "the date and time of the event will be announced later" I want to use single word instead of "date and time"

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Just saying "date" should be sufficient:

The date of the event will be announced later.

In this usage, "date" implies time as well -- if the organizer of the event hasn't even determined the particular date yet, the exact time of day is probably up in the air as well. Another example: when you agree on a date and time to meet someone or do something with someone, you're often said to "make a date" or "have a date," and it's understood that that means the time as well as the day.

Similarly, "time" can imply date, as in:

I remember the time we went camping and Dad swallowed a bug!

In that sense, the speaker is referring to something that happened on a particular date and time, but the specific date and time are less important than the thing that happened.

On the other hand, sometimes you want to identify a particular instant that something happened. For that case, "moment" is a good word, as is the phrase "point in time":

The world changed the moment Armstrong set foot on the moon.

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Both 'point in time' and 'moment' suggest short duration. – user93422 Jul 2 '11 at 1:29
@user93422, true, but "date and time" also identifies a particular minute or even second. For the purpose you described, I think "date" is the best option. – Caleb Jul 2 '11 at 2:13
@user93422: I seriously doubt you'll get a better word than moment for the general-purpose word you seem to seek. Caleb is right that for your example context, Date would imply Time (though in some other contexts, Time can imply Date). In my programming days I used variables called xxx_dttm, which I personally always thought of as Date/TimeStamp of event xxx. – FumbleFingers Jul 2 '11 at 2:24

Use details. You also could rework and use something like appointment.

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Please note that answers here are expected to be substantive, explanatory where appropriate, and written in standard English with standard punctuation and spelling - after all, it is an English Language site! – TrevorD Aug 20 '13 at 0:48

In technical writing where precision is necessary, the term datetime has been coined when it is necessary to be precise that date and time are to be specified. This is particularly common in documentation of computer systems and databases.

I have never, however, seen this term used in a non-technical setting (that I can recall).

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Your answer, is always the most concise description of a future "moment" yet to happen. However, time and place with meaning in the present, is only 1 thing: NOW.

And frankly, anything but NOW doesn't really matter. Yesterday is gone. Tomorrow may never come. For the NOW is all you really have.

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What do you mean exactly? What word do you suggest as an answer? – NVZ May 1 at 6:23
"moment" - which has ties to the Greek word "atamos." There were other Greek words that also meant 'a moment in time;' however by using them you were already comparing that moment to others. – Mike Gianas Jun 2 at 2:22
To say moment in ancient Greek, BC, and to do so without judgement. Where you only identified it as a point in time - the word was 'atamos' and I believe later in history 'atom' or 'atom in time' was derived that same way. – Mike Gianas Jun 2 at 2:25

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