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Mar 22, 2018
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Add notes for the Timezone functions in Date class #431

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Add notes for the Timezone functions in Date class
netpassprod1 Mar 21, 2018
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PowerKiKi Mar 22, 2018
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22 changes: 22 additions & 0 deletions docs/topics/calculation-engine.md
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Expand Up @@ -263,6 +263,28 @@ return an Excel date timestamp.
Takes year, month and day values (and optional hour, minute and second
values) and returns an Excel date timestamp value.

### Timezone support for Excel date timestamp conversions

The default timezone for the date functions in PhpSpreadsheet is UST (Universal Standard Time).
If a different timezone needs to be used, these methods are available:

#### \PhpOffice\PhpSpreadsheet\Shared\Date::getDefaultTimezone()

Returns the current timezone value PhpSpeadsheet is using to handle dates and times.

#### \PhpOffice\PhpSpreadsheet\Shared\Date::setDefaultTimezone($timeZone)

Sets the timezone for Excel date timestamp conversions to $timeZone,
which must be a valid PHP DateTimeZone value.
The return value is a Boolean, where true is success,
and false is failure (e.g. an invalid DateTimeZone value was passed.)

#### \PhpOffice\PhpSpreadsheet\Shared\Date::excelToDateTimeObject($excelDate, $timeZone)
#### \PhpOffice\PhpSpreadsheet\Shared\Date::excelToTimeStamp($excelDate, $timeZone)

These functions support a timezone as an optional second parameter.
This applies a specific timezone to that function call without affecting the default PhpSpreadsheet Timezone.

## Function Reference

### Database Functions
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