update static functions for more advanced TimeStamp generation

ts/smarttime.classes.timestamp.ts

@@ -11,15 +11,46 @@ export class TimeStamp {
   date: Date
 
   /**
-   * The time as linux time
+   * The time as linux time (milliseconds, not seconds though)
    * good for comparison
    */
-  linuxtime: number
-  constructor (creatorArg?: number | TimeStamp) {
+  milliSeconds: number
+
+  /**
+   * The standard epoch time in seconds
+   */
+  epochtime: number
+
+  /**
+   * if derived from another TimeStamp points out the change in milliseconds
+   */
+  change: number = null
+
+  constructor (creatorArg?: number) {
     if (!creatorArg) {
       this.date = new Date()
-      this.linuxtime = this.date.getTime()
+    } else if (typeof creatorArg === 'number') {
+      this.date = new Date(creatorArg)
     }
+    this.milliSeconds = this.date.getTime()
+    this.epochtime = Math.floor(this.milliSeconds / 1000)
+  }
+
+  /**
+   * returns new TimeStamp from milliseconds
+   */
+  static fromMilliSeconds (milliSecondsArg) {
+    return new TimeStamp(milliSecondsArg)
+  }
+
+  /**
+   * returns new TimeStamp for now with change set
+   * @param timeStampArg
+   */
+  static fromTimeStamp (timeStampArg: TimeStamp) {
+    let localTimeStamp = new TimeStamp()
+    localTimeStamp.change = localTimeStamp.milliSeconds - timeStampArg.milliSeconds
+    return localTimeStamp
   }
 
   /**
@@ -27,7 +58,7 @@ export class TimeStamp {
    * @param TimeStampArg
    */
   isOlderThan (TimeStampArg: TimeStamp) {
-    if (this.linuxtime < TimeStampArg.linuxtime) {
+    if (this.milliSeconds < TimeStampArg.milliSeconds) {
       return true
     } else {
       return false
@@ -35,7 +66,7 @@ export class TimeStamp {
   }
 
   isYoungerThan (TimeStampArg: TimeStamp) {
-    if (this.linuxtime > TimeStampArg.linuxtime) {
+    if (this.milliSeconds > TimeStampArg.milliSeconds) {
       return true
     } else {
       return false