Convert Datetime to string in GMT format?

String formatedDt = dt.format('yyyy-MM-dd'T'HH:mm:ss'Z'');

I want to used this string in dyamic SOQL but it gives me formatted string in localtimezone, can anyone help me how do i get it in GTM ?

Answers:

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Method 1

Use DateTime’s formatGMT to format the time according to your specs in GMT.

String formatedDt = dt.formatGMT('yyyy-MM-dd'T'HH:mm:ss'Z'');

Method 2

you can use the dateGMT() method:

dateGMT()

Return the Date component of a Datetime in the GMT time zone.
Signature

public Date dateGMT()

Return Value

Type: Date

Example:

DateTime myDateTime = DateTime.newInstance(2006, 3, 16, 23, 0, 0);
Date myDate = myDateTime.dateGMT();
Date expected = Date.newInstance(2006, 3, 17);
System.assertEquals(expected, myDate);

from the Apex developer Guide

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