New $dateFromString operator
Convert integer (as Unix time stamp) to ISODate:
db.foursquare.aggregate( [
{ $project: { date: {
$dateFromString: {
*dateString: {*
*$concat: [ '@', { $substr: [ '$createdAt', 0, -1 ] } ]*
*}*
}
} } },
] );
Expressed in a different time zone:
db.foursquare.aggregate( [
{ $project: {
_id: 0,
dateInLondon: {
$dateFromString: {
dateString: "2017-07-27 16:22:27.132",
*timezone: "Europe/London"*
}
}
} },
{ $limit: 1 }
] );
{ "dateInLondon" : ISODate("2017-07-27T15:22:27.132Z") }
Expressed in a different time zone:
db.foursquare.aggregate( [
{ $project: {
_id: 0,
dateInLondon: {
$dateFromString: {
dateString: "2017-07-27 16:22:27.132",
*timezone: "+01:00"*
}
}
} },
{ $limit: 1 }
] );
{ "dateInLondon" : ISODate("2017-07-27T15:22:27.132Z") }