Add reminders for overdue tasks (#832)

Co-authored-by: kolaente <k@knt.li>
Reviewed-on: https://kolaente.dev/vikunja/api/pulls/832
Co-authored-by: konrad <konrad@kola-entertainments.de>
Co-committed-by: konrad <konrad@kola-entertainments.de>

pkg/utils/time.go

@@ -0,0 +1,32 @@
+// Vikunja is a to-do list application to facilitate your life.
+// Copyright 2018-2021 Vikunja and contributors. All rights reserved.
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Affero General Public Licensee as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program 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 Affero General Public Licensee for more details.
+//
+// You should have received a copy of the GNU Affero General Public Licensee
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+package utils
+
+import (
+	"time"
+
+	"code.vikunja.io/api/pkg/config"
+)
+
+// GetTimeWithoutNanoSeconds returns a time.Time without the nanoseconds.
+func GetTimeWithoutNanoSeconds(t time.Time) time.Time {
+	tz := config.GetTimeZone()
+
+	// By default, time.Now() includes nanoseconds which we don't save. That results in getting the wrong dates,
+	// so we make sure the time we use to get the reminders don't contain nanoseconds.
+	return time.Date(t.Year(), t.Month(), t.Day(), t.Hour(), t.Minute(), t.Second(), 0, t.Location()).In(tz)
+}