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feat: add isDate() utility to fits module in @observerly/iris #247

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Merged
michealroberts merged 1 commit into from
Nov 10, 2024
Merged

feat: add isDate() utility to fits module in @observerly/iris #247

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36 changes: 36 additions & 0 deletions pkg/fits/header.go
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Original file line number Diff line number Diff line change
Expand Up @@ -12,6 +12,7 @@ package fits

import (
"bytes"
"errors"
"fmt"
"io"
"math"
Expand Down Expand Up @@ -133,6 +134,41 @@ func NewFITSHeader(naxis int32, naxis1 int32, naxis2 int32) FITSHeader {

/*****************************************************************************************************************/

// List of date formats to check against
var dateFormats = []string{
time.DateOnly, // "2006-01-02"
time.RFC1123, // "Mon, 02 Jan 2006 15:04:05 MST"
time.RFC1123Z, // "Mon, 02 Jan 2006 15:04:05 -0700"
time.RFC3339, // "2006-01-02T15:04:05Z07:00"
time.RFC3339Nano, // "2006-01-02T15:04:05.999999999Z07:00"
time.RFC822, // "02 Jan 06 15:04 MST"
time.RFC822Z, // "02 Jan 06 15:04 -0700"
time.ANSIC, // "Mon Jan _2 15:04:05 2006"
time.UnixDate, // "Mon Jan _2 15:04:05 MST 2006"
"2006-01-02", // YYYY-MM-DD
"02-01-2006", // DD-MM-YYYY
"01/02/2006", // MM/DD/YYYY
"2006/01/02", // YYYY/MM/DD
"2006-01-02 15:04:05", // YYYY-MM-DD HH:MM:SS
"2006-01-02T15:04:05Z07:00", // YYYY-MM-DDTHH:MM:SSZ
"January 2, 2006", // Month Day, Year
"2 January 2006", // Day Month Year
}

/*****************************************************************************************************************/

// isDate attempts to parse a string into a time.Time using predefined formats
func isDate(s string) (time.Time, error) {
for _, format := range dateFormats {
if t, err := time.Parse(format, s); err == nil {
return t, nil
}
}
return time.Time{}, errors.New("could not parse date")
}

/*****************************************************************************************************************/

// Set a new key-value pair to the FITS header, with an optional comment:
func (h *FITSHeader) Set(key string, value interface{}, comment string) error {
switch v := value.(type) {
Expand Down
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