dd8c6e05cb
Also minor fix for map path coloring; should start from end of timespan'ed item, not beginning, otherwise gradient is skewed
70 lines
2.6 KiB
Go
70 lines
2.6 KiB
Go
/*
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Timelinize
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Copyright (c) 2013 Matthew Holt
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU Affero General Public License as published
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by the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Affero General Public License for more details.
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You should have received a copy of the GNU Affero General Public License
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along with this program. If not, see <https://www.gnu.org/licenses/>.
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*/
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package imessage
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import (
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"fmt"
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"math"
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"strconv"
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"time"
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)
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// TODO: Standardize these function names. It's Core Data API, Cocoa Epoch.
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// ParseCocoaDate converts a date represented by a string of the decimal number of
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// seconds since the Apple epoch to a Unix date. Example input: "-23919039.000000"
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// TODO: This does seem to result in a timestamp offset by the local timezone (e.g. GMT -6 gets stored as 6 hours later than actual timestamp)
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func ParseCocoaDate(date string) (time.Time, error) {
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fractionalSeconds, err := strconv.ParseFloat(date, 64)
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if err != nil {
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return time.Time{}, fmt.Errorf("parsing string '%s' as float: %w", date, err)
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}
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sec, fraction := math.Modf(fractionalSeconds)
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return time.Unix(int64(sec)+timestampOffsetSeconds, int64(fraction*nanoToSec)).UTC(), nil
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}
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// CocoaSecondsToTime converts Apple timestamp in seconds to a normal timestamp.
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func CocoaSecondsToTime(appleSec int64) time.Time {
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return time.Unix(appleSec+timestampOffsetSeconds, 0).UTC()
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}
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// CocoaNanoToTime converts Apple timestamp in nanoseconds to a normal timestamp.
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func CocoaNanoToTime(appleNano int64) time.Time {
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sec, nano := appleNano/nanoToSec, appleNano%nanoToSec
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return time.Unix(sec+timestampOffsetSeconds, nano).UTC()
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}
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// TimeToCocoaSecondsWithMilli returns the given time in seconds since the Cocoa epoch
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// with millisecond decimal precision.
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func TimeToCocoaSecondsWithMilli(t time.Time) float64 {
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return float64(t.UTC().UnixMilli()-timestampOffsetSeconds*milliToSec) / milliToSec
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}
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func TimeToCocoaNano(t time.Time) int64 {
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return t.UTC().UnixNano() - timestampOffsetSeconds*nanoToSec
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}
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const (
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milliToSec = 1e3 // number of milliseconds in a second
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nanoToSec = 1e9 // number of nanoseconds in a second
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)
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// Apple "Core Data" (part of the Cocoa API) uses an epoch of midnight on Jan 1, 2001 (the "Cocoa Epoch").
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// This is the number of seconds that is after the Unix epoch.
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const timestampOffsetSeconds = 978307200
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