58 lines
1.8 KiB
Go
58 lines
1.8 KiB
Go
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// Package dateutil contains a helper to parse vcard dates
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package dateutil
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import (
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"fmt"
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"strings"
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"time"
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"github.com/emersion/go-vcard"
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)
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// Parse parses a vcard.Field into a time.Time
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func Parse(field *vcard.Field) (d time.Time, err error) {
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if field == nil {
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return d, fmt.Errorf("nil-field given")
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}
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rawDate := field.Value
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if field.Params.Get("X-APPLE-OMIT-YEAR") != "" {
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// Yay, Apple bullshit. They don't use the proper way defined in
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// the RFC to omit the year but specify an invalid format with a
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// replace. As the year 0001 is the "zero-time" in Go we replace
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// the defined year (likely 1604) and move it to the year 1.
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//
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// Field should be something like this:
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// &{1604-09-13 map[X-APPLE-OMIT-YEAR:[1604]] }
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rawDate = strings.Replace(rawDate, field.Params.Get("X-APPLE-OMIT-YEAR"), "0001", 1)
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}
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// And now as we can't rely on `VALUE=DATE` being set (thanks Sabre)
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// we're trying to walk possible formats until we found a matching
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// one…
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for _, fmtCandidate := range []string{
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"20060102", // Most likely, test first
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"2006-01-02", // Invalid as of RFC, used by Apple, see above
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"060102", // RFC compliant with 2-digit year
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"--0102", // RFC-compliant omit-year
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"2006-01", // Shouldn't exist as no day present but is valid
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"2006", // Somewhere in the year
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"20060102T150405", // Full DATE-TIME in RFC
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"20060102T1504", // DATE-TIME in RFC without seconds
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"20060102T15", // DATE-TIME in RFC without minutes & seconds
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} {
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d, err = time.ParseInLocation(fmtCandidate, rawDate, time.Local)
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if err == nil {
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// Yay! It matched. Or at least it had the right length and numbers
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// at the right places so it SHOULD have matched.
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return d, nil
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}
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}
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// Well. We found no matching format.
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return d, fmt.Errorf("no format defined for %q", rawDate)
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}
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