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Fix year padding in to_rfc3339 #10

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Fix year padding in to_rfc3339 #10

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15 changes: 10 additions & 5 deletions src/gleam/time/timestamp.gleam
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Original file line number Diff line number Diff line change
Expand Up @@ -170,18 +170,23 @@ pub fn to_rfc3339(timestamp: Timestamp, offset_minutes offset: Int) -> String {
let offset_minutes = modulo(offset, 60)
let offset_hours = int.absolute_value(floored_div(offset, 60.0))

let n = fn(n) { int.to_string(n) |> string.pad_start(2, "0") }
let n2 = pad_digit(_, to: 2)
let n4 = pad_digit(_, to: 4)
let out = ""
let out = out <> n(years) <> "-" <> n(months) <> "-" <> n(days)
let out = out <> n4(years) <> "-" <> n2(months) <> "-" <> n2(days)
let out = out <> "T"
let out = out <> n(hours) <> ":" <> n(minutes) <> ":" <> n(seconds)
let out = out <> n2(hours) <> ":" <> n2(minutes) <> ":" <> n2(seconds)
case int.compare(offset, 0) {
order.Eq -> out <> "Z"
order.Gt -> out <> "+" <> n(offset_hours) <> ":" <> n(offset_minutes)
order.Lt -> out <> "-" <> n(offset_hours) <> ":" <> n(offset_minutes)
order.Gt -> out <> "+" <> n2(offset_hours) <> ":" <> n2(offset_minutes)
order.Lt -> out <> "-" <> n2(offset_hours) <> ":" <> n2(offset_minutes)
}
}

fn pad_digit(digit: Int, to desired_length: Int) -> String {
int.to_string(digit) |> string.pad_start(desired_length, "0")
}

fn modulo(n: Int, m: Int) -> Int {
case int.modulo(n, m) {
Ok(n) -> n
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24 changes: 24 additions & 0 deletions test/gleam/time/timestamp_test.gleam
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Original file line number Diff line number Diff line change
Expand Up @@ -207,3 +207,27 @@ pub fn to_rfc3339_8_test() {
|> timestamp.to_rfc3339(-120)
|> should.equal("1970-01-01T02:00:00-02:00")
}

pub fn to_rfc3339_9_test() {
timestamp.from_unix_seconds(-62_167_219_200)
|> timestamp.to_rfc3339(0)
|> should.equal("0000-01-01T00:00:00Z")
}

pub fn to_rfc3339_10_test() {
timestamp.from_unix_seconds(-62_135_596_800)
|> timestamp.to_rfc3339(0)
|> should.equal("0001-01-01T00:00:00Z")
}

pub fn to_rfc3339_11_test() {
timestamp.from_unix_seconds(-61_851_600_000)
|> timestamp.to_rfc3339(0)
|> should.equal("0010-01-01T00:00:00Z")
}

pub fn to_rfc3339_12_test() {
timestamp.from_unix_seconds(-59_011_459_200)
|> timestamp.to_rfc3339(0)
|> should.equal("0100-01-01T00:00:00Z")
}
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