Additions to $dateToString

<slide>
<title>Additions to $dateToString</title>

<example inline="1">
db.cities.aggregate( [
    { $match: { population: { $gte: 1000000 } } },
    { $sort: { population: -1 } },
    { $project: {
        _id: 0,
        name: '$name',
        time: {
            *$dateToString:* {
                date: ISODate(),
                format: '\%Y-\%m-\%d \%H:\%M:\%S *%z*',
                *timezone: '$timezone'*
            }
        }
    } }
] );
</example>

<example>{ "name" : "Shanghai", "time" : "2017-07-27 22:49:24 +0800" }
{ "name" : "Buenos Aires", "time" : "2017-07-27 11:49:24 -0300" }
{ "name" : "Mumbai", "time" : "2017-07-27 20:19:24 +0530" }
{ "name" : "Mexico City", "time" : "2017-07-27 09:49:24 -0500" }
{ "name" : "Karachi", "time" : "2017-07-27 19:49:24 +0500" }
{ "name" : "İstanbul", "time" : "2017-07-27 17:49:24 +0300" }
…
</example>
</slide>