diff --git a/coverage.txt b/coverage.txt
index 74461cb..4d37136 100644
--- a/coverage.txt
+++ b/coverage.txt
@@ -205,6 +205,32 @@ github.com/observerly/iris/pkg/frames/light.go:74.2,120.8 7 1
 github.com/observerly/iris/pkg/frames/master.go:17.79,21.16 2 1
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 github.com/observerly/iris/pkg/frames/master.go:26.2,35.8 2 1
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@@ -239,32 +265,6 @@ github.com/observerly/iris/pkg/qsort/qsort.go:127.2,129.27 2 2
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@@ -398,15 +398,15 @@ github.com/observerly/iris/pkg/statistics/stats.go:207.24,212.3 3 770008
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@@ -473,128 +473,126 @@ github.com/observerly/iris/pkg/fits/fits.go:454.10,456.61 1 0
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+github.com/observerly/iris/pkg/fits/header.go:524.2,524.23 1 85
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+github.com/observerly/iris/pkg/fits/header.go:528.2,528.59 1 85
+github.com/observerly/iris/pkg/fits/header.go:534.73,536.18 1 16
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+github.com/observerly/iris/pkg/fits/header.go:543.2,543.23 1 16
+github.com/observerly/iris/pkg/fits/header.go:543.23,545.3 1 2
+github.com/observerly/iris/pkg/fits/header.go:545.8,545.30 1 14
+github.com/observerly/iris/pkg/fits/header.go:545.30,547.3 1 14
+github.com/observerly/iris/pkg/fits/header.go:549.2,556.61 3 16
+github.com/observerly/iris/pkg/fits/header.go:556.61,559.3 1 4
+github.com/observerly/iris/pkg/fits/header.go:559.8,562.3 1 12
+github.com/observerly/iris/pkg/fits/header.go:565.2,565.66 1 16
+github.com/observerly/iris/pkg/fits/header.go:571.33,574.2 2 11
+github.com/observerly/iris/pkg/fits/header.go:579.46,616.2 22 1
+github.com/observerly/iris/pkg/fits/header.go:621.92,628.37 3 0
+github.com/observerly/iris/pkg/fits/header.go:628.37,631.22 2 0
+github.com/observerly/iris/pkg/fits/header.go:631.22,633.4 1 0
+github.com/observerly/iris/pkg/fits/header.go:636.3,639.29 2 0
+github.com/observerly/iris/pkg/fits/header.go:642.2,642.18 1 0
 github.com/observerly/iris/pkg/photometry/convolution.go:17.94,20.36 2 1
 github.com/observerly/iris/pkg/photometry/convolution.go:20.36,21.37 1 400
 github.com/observerly/iris/pkg/photometry/convolution.go:21.37,32.23 5 240000
@@ -647,7 +645,7 @@ github.com/observerly/iris/pkg/photometry/stars.go:95.101,101.2 3 2
 github.com/observerly/iris/pkg/photometry/stars.go:106.97,137.2 13 1
 github.com/observerly/iris/pkg/photometry/stars.go:143.119,147.25 2 95855
 github.com/observerly/iris/pkg/photometry/stars.go:147.25,151.39 2 862695
-github.com/observerly/iris/pkg/photometry/stars.go:151.39,154.4 2 862254
+github.com/observerly/iris/pkg/photometry/stars.go:151.39,154.4 2 862187
 github.com/observerly/iris/pkg/photometry/stars.go:157.2,159.23 2 95855
 github.com/observerly/iris/pkg/photometry/stars.go:166.89,170.25 2 7
 github.com/observerly/iris/pkg/photometry/stars.go:170.25,171.20 1 10253216
@@ -660,62 +658,62 @@ github.com/observerly/iris/pkg/photometry/stars.go:203.95,216.34 6 5
 github.com/observerly/iris/pkg/photometry/stars.go:216.34,222.3 3 85435
 github.com/observerly/iris/pkg/photometry/stars.go:224.2,231.29 4 5
 github.com/observerly/iris/pkg/photometry/stars.go:231.29,237.44 3 10420
-github.com/observerly/iris/pkg/photometry/stars.go:237.44,240.4 2 10173
+github.com/observerly/iris/pkg/photometry/stars.go:237.44,240.4 2 10170
 github.com/observerly/iris/pkg/photometry/stars.go:243.2,243.31 1 5
 github.com/observerly/iris/pkg/photometry/stars.go:248.85,265.26 8 6
-github.com/observerly/iris/pkg/photometry/stars.go:265.26,270.38 2 8581
-github.com/observerly/iris/pkg/photometry/stars.go:270.38,271.41 1 18281
+github.com/observerly/iris/pkg/photometry/stars.go:265.26,270.38 2 8578
+github.com/observerly/iris/pkg/photometry/stars.go:270.38,271.41 1 18272
 github.com/observerly/iris/pkg/photometry/stars.go:271.41,272.13 1 1130
-github.com/observerly/iris/pkg/photometry/stars.go:275.4,275.39 1 17151
-github.com/observerly/iris/pkg/photometry/stars.go:275.39,276.42 1 44135
+github.com/observerly/iris/pkg/photometry/stars.go:275.4,275.39 1 17142
+github.com/observerly/iris/pkg/photometry/stars.go:275.39,276.42 1 44108
 github.com/observerly/iris/pkg/photometry/stars.go:276.42,277.14 1 4636
-github.com/observerly/iris/pkg/photometry/stars.go:281.5,284.53 2 39499
-github.com/observerly/iris/pkg/photometry/stars.go:284.53,291.22 5 224543
+github.com/observerly/iris/pkg/photometry/stars.go:281.5,284.53 2 39472
+github.com/observerly/iris/pkg/photometry/stars.go:284.53,291.22 5 223686
 github.com/observerly/iris/pkg/photometry/stars.go:291.22,292.27 1 7278
-github.com/observerly/iris/pkg/photometry/stars.go:299.3,309.17 5 1303
+github.com/observerly/iris/pkg/photometry/stars.go:299.3,309.17 5 1300
 github.com/observerly/iris/pkg/photometry/stars.go:309.17,311.4 1 180
-github.com/observerly/iris/pkg/photometry/stars.go:311.9,312.24 1 1123
-github.com/observerly/iris/pkg/photometry/stars.go:312.24,314.5 1 3957
-github.com/observerly/iris/pkg/photometry/stars.go:316.4,316.38 1 1123
-github.com/observerly/iris/pkg/photometry/stars.go:319.3,319.19 1 1303
+github.com/observerly/iris/pkg/photometry/stars.go:311.9,312.24 1 1120
+github.com/observerly/iris/pkg/photometry/stars.go:312.24,314.5 1 3930
+github.com/observerly/iris/pkg/photometry/stars.go:316.4,316.38 1 1120
+github.com/observerly/iris/pkg/photometry/stars.go:319.3,319.19 1 1300
 github.com/observerly/iris/pkg/photometry/stars.go:322.2,325.31 3 6
 github.com/observerly/iris/pkg/photometry/stars.go:331.106,333.26 1 3
-github.com/observerly/iris/pkg/photometry/stars.go:333.26,336.71 2 664
-github.com/observerly/iris/pkg/photometry/stars.go:336.71,342.39 3 1283
-github.com/observerly/iris/pkg/photometry/stars.go:342.39,343.40 1 42339
-github.com/observerly/iris/pkg/photometry/stars.go:343.40,348.46 3 1397187
-github.com/observerly/iris/pkg/photometry/stars.go:348.46,350.20 2 1374912
-github.com/observerly/iris/pkg/photometry/stars.go:350.20,352.8 1 1360667
-github.com/observerly/iris/pkg/photometry/stars.go:355.6,357.19 3 1397187
-github.com/observerly/iris/pkg/photometry/stars.go:362.4,365.19 3 1283
+github.com/observerly/iris/pkg/photometry/stars.go:333.26,336.71 2 663
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+github.com/observerly/iris/pkg/photometry/stars.go:348.46,350.20 2 1372734
+github.com/observerly/iris/pkg/photometry/stars.go:350.20,352.8 1 1358493
+github.com/observerly/iris/pkg/photometry/stars.go:355.6,357.19 3 1395009
+github.com/observerly/iris/pkg/photometry/stars.go:362.4,365.19 3 1281
 github.com/observerly/iris/pkg/photometry/stars.go:365.19,367.5 1 0
-github.com/observerly/iris/pkg/photometry/stars.go:369.4,384.44 10 1283
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-github.com/observerly/iris/pkg/photometry/stars.go:388.4,396.16 2 1283
+github.com/observerly/iris/pkg/photometry/stars.go:369.4,384.44 10 1281
+github.com/observerly/iris/pkg/photometry/stars.go:384.44,386.5 1 1281
+github.com/observerly/iris/pkg/photometry/stars.go:388.4,396.16 2 1281
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 github.com/observerly/iris/pkg/photometry/stars.go:407.143,412.26 3 2
-github.com/observerly/iris/pkg/photometry/stars.go:412.26,420.32 4 417
-github.com/observerly/iris/pkg/photometry/stars.go:420.32,421.33 1 13761
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-github.com/observerly/iris/pkg/photometry/stars.go:423.29,424.14 1 121764
-github.com/observerly/iris/pkg/photometry/stars.go:426.5,432.47 4 332349
-github.com/observerly/iris/pkg/photometry/stars.go:432.47,434.15 2 329125
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-github.com/observerly/iris/pkg/photometry/stars.go:438.5,440.13 3 332349
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+github.com/observerly/iris/pkg/photometry/stars.go:426.5,432.47 4 331552
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 github.com/observerly/iris/pkg/photometry/stars.go:444.18,446.4 1 0
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 github.com/observerly/iris/pkg/photometry/stars.go:451.19,452.12 1 0
-github.com/observerly/iris/pkg/photometry/stars.go:456.3,462.42 4 417
-github.com/observerly/iris/pkg/photometry/stars.go:462.42,463.43 1 6815
-github.com/observerly/iris/pkg/photometry/stars.go:463.43,466.29 2 116129
-github.com/observerly/iris/pkg/photometry/stars.go:466.29,467.14 1 44028
-github.com/observerly/iris/pkg/photometry/stars.go:470.5,474.47 3 72101
-github.com/observerly/iris/pkg/photometry/stars.go:474.47,476.15 2 71847
-github.com/observerly/iris/pkg/photometry/stars.go:476.15,478.7 1 54125
-github.com/observerly/iris/pkg/photometry/stars.go:480.5,481.18 2 72101
-github.com/observerly/iris/pkg/photometry/stars.go:486.3,490.81 3 417
-github.com/observerly/iris/pkg/photometry/stars.go:490.81,491.12 1 79
+github.com/observerly/iris/pkg/photometry/stars.go:456.3,462.42 4 416
+github.com/observerly/iris/pkg/photometry/stars.go:462.42,463.43 1 6792
+github.com/observerly/iris/pkg/photometry/stars.go:463.43,466.29 2 115600
+github.com/observerly/iris/pkg/photometry/stars.go:466.29,467.14 1 43840
+github.com/observerly/iris/pkg/photometry/stars.go:470.5,474.47 3 71760
+github.com/observerly/iris/pkg/photometry/stars.go:474.47,476.15 2 71506
+github.com/observerly/iris/pkg/photometry/stars.go:476.15,478.7 1 53798
+github.com/observerly/iris/pkg/photometry/stars.go:480.5,481.18 2 71760
+github.com/observerly/iris/pkg/photometry/stars.go:486.3,490.81 3 416
+github.com/observerly/iris/pkg/photometry/stars.go:490.81,491.12 1 78
 github.com/observerly/iris/pkg/photometry/stars.go:495.3,504.25 5 338
 github.com/observerly/iris/pkg/photometry/stars.go:508.2,510.39 2 2
 github.com/observerly/iris/pkg/iris/monochrome.go:43.95,61.2 4 13
diff --git a/pkg/fits/fits_test.go b/pkg/fits/fits_test.go
index 0c8b869..39f0f19 100644
--- a/pkg/fits/fits_test.go
+++ b/pkg/fits/fits_test.go
@@ -502,7 +502,7 @@ func TestNewAddObservationEntry(t *testing.T) {
 		Observer:   "Michael Roberts",
 	})
 
-	if fit.Header.Dates["DATE-OBS"].Value != "2022-05-14T00:00:00Z" {
+	if fit.Header.Strings["DATE-OBS"].Value != "2022-05-14" {
 		t.Errorf("Expected the DATE-OBS to be 2022-05-14, but got %s", fit.Header.Strings["DATE-OBS"].Value)
 	}
 
diff --git a/pkg/fits/header.go b/pkg/fits/header.go
index a7c4c42..7f2ce65 100644
--- a/pkg/fits/header.go
+++ b/pkg/fits/header.go
@@ -138,7 +138,7 @@ var dateFormats = []string{
 /*****************************************************************************************************************/
 
 // isDate attempts to parse a string into a time.Time using predefined formats
-func isDate(s string) (time.Time, error) {
+func IsDate(s string) (time.Time, error) {
 	for _, format := range dateFormats {
 		if t, err := time.Parse(format, s); err == nil {
 			return t, nil
@@ -158,16 +158,6 @@ func (h *FITSHeader) Set(key string, value interface{}, comment string) error {
 			Comment: comment,
 		}
 	case string:
-		// If the string could be a date, parse it as a date:
-		if d, err := isDate(v); err == nil {
-			h.Dates[key] = FITSHeaderString{
-				Value:   d.Format(time.RFC3339),
-				Comment: comment,
-			}
-			return nil
-		}
-
-		// Otherwise, simply set the string value:
 		h.Strings[key] = FITSHeaderString{
 			Value:   v,
 			Comment: comment,
diff --git a/pkg/fits/header_test.go b/pkg/fits/header_test.go
index 22b8e84..b2e96e9 100644
--- a/pkg/fits/header_test.go
+++ b/pkg/fits/header_test.go
@@ -710,7 +710,7 @@ func TestReadHeaderFromFile(t *testing.T) {
 	}
 
 	// Check that the conforming DATE header value exists as per FITS standard:
-	if len(h.Dates["DATE"].Value) == 0 {
+	if len(h.Strings["DATE"].Value) == 0 {
 		t.Errorf("ReadHeaderFromFile() expected DATE to be non-zero length: got %v, want %v", len(h.Strings["DATE"].Value), 0)
 	}