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timeutils.go
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timeutils.go
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// Copyright © 2018 Jeff Coffler <[email protected]>
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package main
import (
"fmt"
"time"
)
// Return difference between two times in a printable format
func getTimeDiffString(a, b time.Time) (timeDiff string) {
year, month, day, hour, min, sec := getTimeDiffNumbers(a, b)
// Format the output
timeDiff = ""
if year > 0 {
if year > 1 {
timeDiff += fmt.Sprintf("%d years, ", year)
} else {
timeDiff += fmt.Sprintf("%d year, ", year)
}
}
if len(timeDiff) > 0 || month > 0 {
if month == 0 || month > 1 {
timeDiff += fmt.Sprintf("%d months, ", month)
} else {
timeDiff += fmt.Sprintf("%d month, ", month)
}
}
if len(timeDiff) > 0 || day > 0 {
if day == 0 || day > 1 {
timeDiff += fmt.Sprintf("%d days, ", day)
} else {
timeDiff += fmt.Sprintf("%d day, ", day)
}
}
switch {
case len(timeDiff) > 0 || hour > 0:
timeDiff += fmt.Sprintf("%d:%2.2d:%2.2d", hour, min, sec)
case min > 0:
timeDiff = fmt.Sprintf("%d:%2.2d", min, sec)
default:
if sec == 0 || sec > 1 {
timeDiff = fmt.Sprintf("%d seconds", sec)
} else {
timeDiff = fmt.Sprintf("%d second", sec)
}
}
return
}
func daysIn(year int, month time.Month) int {
return time.Date(year, month+1, 0, 0, 0, 0, 0, time.UTC).Day()
}
// Return difference between two times numerically
// Source: https://stackoverflow.com/questions/36530251/golang-time-since-with-months-and-years
func getTimeDiffNumbers(from, to time.Time) (years, months, days, hours, minutes, seconds int) {
if from.Location() != to.Location() {
to = to.In(from.Location())
}
if from.After(to) {
from, to = to, from
}
y1, M1, d1 := from.Date()
y2, M2, d2 := to.Date()
h1, m1, s1 := from.Clock()
h2, m2, s2 := to.Clock()
years = y2 - y1
months = int(M2 - M1)
days = d2 - d1
hours = h2 - h1
minutes = m2 - m1
seconds = s2 - s1
if seconds < 0 {
seconds += 60
minutes--
}
if minutes < 0 {
minutes += 60
hours--
}
if hours < 0 {
hours += 24
days--
}
if days < 0 {
days += daysIn(y2, M2-1)
months--
}
if months < 0 {
months += 12
years--
}
return
}