date and gz helper methods

date/date.go

@@ -0,0 +1,89 @@
+// Copyright 2025 Patial Tech (Ankit Patial).
+//
+// This file is part of code.patial.tech/go/appcore, which is MIT licensed.
+// See http://opensource.org/licenses/MIT
+
+package date
+
+import (
+	"time"
+)
+
+// ParseISODate ISO date format to utc
+func ParseISODate(dt string) (time.Time, error) {
+	d, err := time.Parse(time.RFC3339, dt)
+	if err != nil {
+		return time.Time{}, err
+	}
+
+	return d.UTC(), nil
+}
+
+func CountWorkingDays(from, end time.Time) int {
+	workingDays := 0
+	start := from // from.AddDate(0, 0, 1)
+	for d := start; d.Before(end) || d.Equal(end); d = d.AddDate(0, 0, 1) {
+		weekday := d.Weekday()
+		if weekday != time.Saturday && weekday != time.Sunday {
+			workingDays++
+		}
+	}
+
+	return workingDays
+}
+
+func StartOfDay(date time.Time) time.Time {
+	year, month, day := date.Date()
+	return time.Date(year, month, day, 0, 0, 0, 0, date.Location())
+}
+
+func EndOfDay(date time.Time) time.Time {
+	year, month, day := date.Date()
+	return time.Date(year, month, day, 23, 59, 59, 0, date.Location())
+}
+
+func StartOfMonth(date time.Time) time.Time {
+	year, month, _ := date.Date()
+	return time.Date(year, month, 1, 0, 0, 0, 0, date.Location())
+}
+
+func EndOfMonth(date time.Time) time.Time {
+	return EndOfDay(date.AddDate(0, 1, -date.Day()))
+}
+
+func StartOfWeek(date time.Time) time.Time {
+	return StartOfDay(date.AddDate(0, 0, int(time.Sunday)-int(date.Weekday())))
+}
+
+func EndOfWeek(date time.Time) time.Time {
+	return EndOfDay(date.AddDate(0, 0, int(time.Saturday-date.Weekday())))
+}
+
+func StartOfYear(date time.Time) time.Time {
+	year, _, _ := date.Date()
+	return time.Date(year, 1, 1, 0, 0, 0, 0, date.Location())
+}
+
+func EndOfYear(date time.Time) time.Time {
+	return EndOfDay(date.AddDate(0, int(time.December-date.Month())+1, -date.Day()))
+}
+
+func LastWeek(date time.Time) time.Time {
+	return date.AddDate(0, 0, -7)
+}
+
+func LastMonth(date time.Time) time.Time {
+	return date.AddDate(0, -1, 0)
+}
+
+func SubtractMonths(date time.Time, m int) time.Time {
+	return date.AddDate(0, -m, 0)
+}
+
+func SubtractDays(date time.Time, d int) time.Time {
+	return date.AddDate(0, 0, -d)
+}
+
+func SubtractAYear(date time.Time) time.Time {
+	return date.AddDate(-1, 0, 0)
+}

gz/gz.go

@@ -0,0 +1,46 @@
+// Copyright 2025 Patial Tech (Ankit Patial).
+//
+// This file is part of code.patial.tech/go/appcore, which is MIT licensed.
+// See http://opensource.org/licenses/MIT
+
+package gz
+
+import (
+	"bytes"
+	"compress/gzip"
+	"io"
+)
+
+func Zip(data []byte) ([]byte, error) {
+	var b bytes.Buffer
+	gz := gzip.NewWriter(&b)
+	if _, err := gz.Write(data); err != nil {
+		return nil, err
+	}
+
+	if err := gz.Flush(); err != nil {
+		return nil, err
+	}
+
+	if err := gz.Close(); err != nil {
+		return nil, err
+	}
+
+	return b.Bytes(), nil
+}
+
+func UnZip(data []byte) ([]byte, error) {
+	b := bytes.NewBuffer(data)
+	var r io.Reader
+	r, err := gzip.NewReader(b)
+	if err != nil {
+		return nil, err
+	}
+
+	var resB bytes.Buffer
+	if _, err := resB.ReadFrom(r); err != nil {
+		return nil, err
+	}
+
+	return resB.Bytes(), nil
+}