Make FormatTimeString and ParseTimeString methods

[ValarDragon]

Summary

We should make string counterparts to FormatTimeBytes and ParseTimeBytes

cosmos-sdk/types/utils.go

Lines 64 to 77 in eee23d9

	// Formats a time.Time into a []byte that can be sorted
	func FormatTimeBytes(t time.Time) []byte {
	return []byte(t.UTC().Round(0).Format(SortableTimeFormat))
	}
	// Parses a []byte encoded using FormatTimeKey back into a time.Time
	func ParseTimeBytes(bz []byte) (time.Time, error) {
	str := string(bz)
	t, err := time.Parse(SortableTimeFormat, str)
	if err != nil {
	return t, err
	}
	return t.UTC().Round(0), nil
	}

, and then make the bytes method call into those

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[tac0turtle]

can we make use of generics here?

[gopherine]

@ValarDragon would like to work on it , just to confirm we want to return string representation of time here ?

[alexanderbez]

For state serialization, we want bytes. See the APIs @ValarDragon pointed out in the issue body 👍