What does UTC mean and how long will we wait :)?

Coordinated Universal Time (UTC) is the primary time standard by which the world regulates clocks and time. It is one of several closely related successors to Greenwich Mean Time (GMT). For most purposes, UTC is synonymous with GMT, but GMT is no longer precisely defined by the scientific community.

In Japan it is UTC/GMT +9 hours, we add +3 thus it starts at 12 o'clock at midday or at noon on the 2nd of March in Japan and I think nobody knows the duration of this scheduled maintenance period. But I think we will be able to enjoy italki on Sunday again.

What does UTC mean and how long will we wait :)?

As you know, I saw an alert following from italki, "Alert: italki will have a scheduled maintenance period on Saturday, Mar 2 from 3:00 AM UTC."

After I read it, I was thinking about it. When will start the maintenance start on Japanese time? What is UTC? What does it mean?

As usual, I checked a dictionary before I asked here as usual :) UTC is universal time coordinated. Afterwards, I have a question more, what time is UTC? How long does it have is the time difference between UTC and Japan time? And   Then, I searched it. Okey, I found(or learned) there is -9 hours.

From Friday, Mar 1 6:00 PM in Japan?So, now (almost Mar 2 1:00 AM) is the time under maintenace in here? I don't know it. (Unsure what this means.  You are uncertain?)

I will just try to uplard upload this entry.

This is great work.  I understood what you were asking.  I'm not sure either. : )

What does UTC mean and how long will we wait :)?
As you know, I saw an alert following from italki, "Alert: italki will have a scheduled maintenance period on Saturday, Mar 2 from 3:00 AM UTC."
ご存じの通り、私はアイトーキから次の注意を見ました。「ご注意：アイトーキはメンテナンス期間を計画します。UTC三月二日土曜日の午前三時に。」
After I read it, I was thinking about it.
それを読み終えた後で、考えました。
When will the maintenance start on Japanese time?
日本時間のいつからメンテナンスは始まるのでしょう？
What is UTC? What does it mean?
UTCとは？何を意味するのでしょう？
As usual, I checked a dictionary before I asked here:)
いつも通り、ここで尋ねる前に辞書を調べました（笑）。
UTC is universal time coordinated.
UTCは標準世界時です。
Afterwards, I have a question more, what time is UTC?
その後、私はもう一つ疑問を持ちました、UTCって何時でしょう？
How long does is the time difference between UTC and Japan time?
日本とUTCの間にはどれくらいの長さの時差があるのでしょう？
Then, I searched it. I found(or learned) there is -9 hours.
それから、私は調べました。私はそれがマイナス9時間だと分かりました。
From Friday, Mar 1 6:00 PM in Japan?
三月一日金曜日の午後六時からでしょうか？
So, now (almost Mar 2 1:00 AM) is the time under maintenance in here?
ですから、いま（ほぼ三月二日の午前一時）はメンテナンス中でしょうか？
I don't know it.
分かりません。

(Unsure what this means. You are uncertain?)
（この意味が定かではありません。不確かなのですか？）＞Yes I was when I wrote it. But now I understand what is my misunderstanding.

I will just try to upload this entry.
私はただ、この投稿をアップロードしてみます。

This is great work. I understood what you were asking. I'm not sure either. : )
大変良くできました。私はあなたの尋ねたかったことを理解しました。両方とも、確かではありませんが（笑）

What does UTC mean and how long will we wait :)?
Coordinated Universal Time (UTC) is the primary time standard by which the world regulates clocks and time.
協定世界時（UTC)は世界規格の時計や時間のための第一義的な標準時です。
It is one of several closely related successors to Greenwich Mean Time (GMT).
それは、グリニッジ標準時といくらかの密接に関係した後継の一つです。
For most purposes, UTC is synonymous with GMT, but GMT is no longer precisely defined by the scientific community.
UTCは、ほとんどGMTと同じ意味です。しかし、GMTはもはや科学界によって正確に定義されていません。
In Japan it is UTC/GMT +9 hours, we add +3 thus it starts at 12 o'clock at midday or at noon on the 2nd of March in Japan and I think nobody knows the duration of this scheduled maintenance period.
日本時間はUTC/GMTの9時間プラスです。それは日本の3月2日午前12時か正午0時の開始ですから、私たちはプラス3時間を加えます。そして、私は、誰もこのメンテナンスのスケジュールの期間を知らないと思います。
But I think we will be able to enjoy italki on Sunday again.
でも、私たちはアイトーキを日曜日には、再び楽しむことができるでしょう。

Thank you for your teaching. I understand my misunderstanding about the time difference between UTC and Japan. I have a question. Why did you add +3? Was that mean about our time difference or maintenance period which you guess or anything else?