TL;DR

Function that provides ability to compare two structs in human-readable diff output with testify package. Try it online: https://go.dev/play/p/1v288fhRk9T

Legend

testify package for golang provides Equal function to compare structs (lists, arrays, etc). Unfortunately, it doesn't prints actual values for time objects in output diff.

e.g.

expectedTime, _ := time.Parse("2006-01-02", "2020-05-22")
actualTime, _ := time.Parse("2006-01-02", "2020-05-21")

expected := &event{
	StartAt: &expectedTime,
	Name:    "some val",
}
actual := &event{
	StartAt: &actualTime,
	Name:    "some val",
}

require.Equal(t, expected, actual)

For two structs with different values per time defined fields - it's output results into diff with pointers:

=== RUN   TestComparisonOutput
	Error:      	Not equal: 
					expected: &main.event{StartAt:time.Date(2020, time.May, 22, 0, 0, 0, 0, time.UTC), Name:"some val"}
					actual  : &main.event{StartAt:time.Date(2020, time.May, 21, 0, 0, 0, 0, time.UTC), Name:"some val"}
					
					Diff:
					--- Expected
					+++ Actual
					@@ -3,3 +3,3 @@
						wall: (uint64) 0,
					-  ext: (int64) 63725702400,
					+  ext: (int64) 63725616000,
						loc: (*time.Location)(<nil>)
	Test:       	TestComparisonOutput/check_comparison_output
FAIL

Solution example

expectedTime, _ := time.Parse("2006-01-02", "2020-05-22")
actualTime, _ := time.Parse("2006-01-02", "2020-05-21")

expected := &event{
	StartAt: &expectedTime,
	Name:    "some val 1",
}
actual := &event{
	StartAt: &actualTime,
	Name:    "some val",
}

equalStruct(t, expected, actual)

Following example basically mimics Equal functionality from testify package with slight change of output format:

=== RUN   TestComparisonOutput
	Error:      	Not equal: 
					expected: &main.event{StartAt:time.Date(2020, time.May, 22, 0, 0, 0, 0, time.UTC), Name:"some val"}
					actual  : &main.event{StartAt:time.Date(2020, time.May, 21, 0, 0, 0, 0, time.UTC), Name:"some val"}
					
					Diff:
					--- Expected
					+++ Actual
					@@ -1,3 +1,3 @@
						(*main.event)({
					- StartAt: (*time.Time)(2020-05-22 00:00:00 +0000 UTC),
					+ StartAt: (*time.Time)(2020-05-21 00:00:00 +0000 UTC),
						Name: (string) (len=8) "some val"
	Test:       	TestComparisonOutput/check_comparison_output
FAIL