增加utc日期的计算

src/utils/utcdate.util.ts

@@ -0,0 +1,55 @@
+export const ONE_DAY = 24 * 60 * 60 * 1000
+
+// format the date to the format we want
+export const formatDate = (date: Date): string => {
+  const year = date.getUTCFullYear()
+  const month = (date.getUTCMonth() + 1 + '').padStart(2, '0')
+  const day = (date.getUTCDate() + '').padStart(2, '0')
+  return `${year}${month}${day}`
+}
+
+// get formated datestring of yesterday
+export const yesterday = (date?: Date) => {
+  date = date || new Date()
+  date.setUTCDate(date.getUTCDate() - 1)
+  return date
+}
+
+export const nextday = (date?: Date) => {
+  date = date || new Date()
+  date.setUTCDate(date.getUTCDate() + 1)
+  return date
+}
+
+// calc days between two Date
+export function daysBetween(date1: Date, date2: Date) {
+  // hours*minutes*seconds*milliseconds
+  const diffInMs = Math.abs(date1.getTime() - date2.getTime())
+  const diffInDays = Math.round(diffInMs / ONE_DAY)
+  return diffInDays
+}
+
+// get begin of one day
+export const getDayBegin = (date: Date): Date => {
+  const year = date.getUTCFullYear()
+  const month = date.getUTCMonth()
+  const day = date.getUTCDate()
+  return new Date(year, month, day)
+}
+
+// get begin of n day ago
+export const getNDayAgo = (n: number, begin: boolean): Date => {
+  const date = new Date(Date.now() - n * ONE_DAY)
+  if (begin) {
+    return getDayBegin(date)
+  } else {
+    return date
+  }
+}
+
+// get begin of this month
+export const getMonthBegin = (date: Date): Date => {
+  const year = date.getUTCFullYear()
+  const month = date.getUTCMonth()
+  return new Date(year, month, 1)
+}