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date.go
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date.go
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// Copyright 2019, Keychain Foundation Ltd.
// This file is part of the dipperin-core library.
//
// The dipperin-core library is free software: you can redistribute
// it and/or modify it under the terms of the GNU Lesser General Public License
// as published by the Free Software Foundation, either version 3 of the
// License, or (at your option) any later version.
//
// The dipperin-core library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with this program. If not, see <https://www.gnu.org/licenses/>.
package util
import (
"strings"
"time"
"errors"
)
// TimeLayout helps to parse a date string of the format YYYY-MM-DD
// Intended to be used with the following function:
// time.Parse(TimeLayout, date)
var TimeLayout = "2006-01-02" //this represents YYYY-MM-DD
// ParseDateRange parses a date range string of the format start:end
// where the start and end date are of the format YYYY-MM-DD.
// The parsed dates are time.Time and will return the zero time for
// unbounded dates, ex:
// unbounded start: :2000-12-31
// unbounded end: 2000-12-31:
func ParseDateRange(dateRange string) (startDate, endDate time.Time, err error) {
dates := strings.Split(dateRange, ":")
if len(dates) != 2 {
err = errors.New("bad date range, must be in format date:date")
return
}
parseDate := func(date string) (out time.Time, err error) {
if len(date) == 0 {
return
}
out, err = time.Parse(TimeLayout, date)
return
}
startDate, err = parseDate(dates[0])
if err != nil {
return
}
endDate, err = parseDate(dates[1])
if err != nil {
return
}
return
}