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Type:
Task
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Resolution: Fixed
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Priority:
Major - P3
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Affects Version/s: None
$dateFromString now supports the %j format specifier, "Day of Year", which allows a user to parse a date from a string containing only the year and a number to indicate which day it is of that year.
Note that %j counts the days from 0-355, not 1-356.
Description of Linked Ticket
The $dateFromString Format Specifiers don't include the strftime %j modifier which is used to decode the day of the year as a decimal number (range 001 to 366).
It appears that this modifier is understood as part of kDateToStringFormatMap from timelib's TIMELIB_FORMAT_DAY_OF_YEAR when converting from a date to a string, but not from a string to a date.
For example:
db.foo.drop()
db.foo.insert({ _id: 1, d: "2020-194-14:24:45.463" });
db.foo.aggregate( [ {
$project: {
date: {
$dateFromString: {
dateString: "%d",
format: "%Y-%j-%H:%M:%S.%L"
}
}
}
} ] )
// "errmsg" : "Failed to optimize pipeline :: caused by :: Invalid format character '%j' in format string",
Note that for the above we were able to work around this limitation as follows:
db.foo.drop()
db.foo.insert({ _id: 1, d: "2020-194-14:24:45.463" });
db.foo.aggregate([
{ $project: {
date: {
$let: {
vars: {
parts: { $split: [ "$d", "-" ] }
},
in: {
$add: [
{ $toDate: { $concat: [
{ $arrayElemAt: [ "$$parts", 0 ] },
"-01-01T",
{ $arrayElemAt: [ "$$parts", 2 ] } ]
} },
{ $multiply: [
{ $subtract: [
{ $toInt: { $arrayElemAt: [ "$$parts", 1 ] } },
1 ] }, 86400000 ] }
]
}
}
}
}}
]);
// { "_id" : 1, "date" : ISODate("2020-07-12T14:24:45.463Z") }
- documents
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SERVER-50336 $dateFromString support for additional format specifiers (such as "%j" for day of year)
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- Closed
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