Remove daylight savings from Nasdaq Provider (#137)

* Remove daylight savings

* Update index.ts

packages/salmon-provider-nasdaq/__test__/fetch_asset_prices_multiple.test.ts

@@ -72,12 +72,12 @@ describe('multi price fetch', () => {
     const prices = await priceManager.fetchAssetPrices()
     expect(prices[0].asset).toStrictEqual('TSLA')
     expect(prices[0].price).toStrictEqual(new BigNumber(714.63))
-    expect(prices[0].timestamp).toStrictEqual(new BigNumber(1628193602430))
+    expect(prices[0].timestamp).toStrictEqual(new BigNumber(1628197202430))
     expect(prices[1].asset).toStrictEqual('AAPL')
     expect(prices[1].price).toStrictEqual(new BigNumber(147.06))
-    expect(prices[1].timestamp).toStrictEqual(new BigNumber(1628193602286))
+    expect(prices[1].timestamp).toStrictEqual(new BigNumber(1628197202286))
     expect(prices[2].asset).toStrictEqual('FB')
     expect(prices[2].price).toStrictEqual(new BigNumber(362.97))
-    expect(prices[2].timestamp).toStrictEqual(new BigNumber(1628193603279))
+    expect(prices[2].timestamp).toStrictEqual(new BigNumber(1628197203279))
   })
 })

packages/salmon-provider-nasdaq/src/index.ts

@@ -19,22 +19,10 @@ export class NasdaqPriceProvider implements PriceProvider {
   ) {
   }
 
-  // This is slightly complex due to the fact that Eastern Time
-  // undergoes daylight saving
+  // This converts from EST (Eastern Standard Time) to UTC
   processTimestamp (timestamp: string): number {
-    const priceDate = new Date(timestamp + 'Z')
-    const dateNow = new Date()
-    const paddMs = String(dateNow.getUTCMilliseconds()).padStart(3, '0')
-
-    // en-CA instead of en-US is needed here ('-' vs '/')
-    const dateNowEt = new Date(dateNow.toLocaleString('en-CA',
-      {
-        timeZone: 'America/New_York',
-        hour12: false
-      }).replace(', ', 'T') + `.${paddMs}Z`)
-
-    const timezoneOffset = dateNow.getTime() - dateNowEt.getTime()
-    return priceDate.getTime() + timezoneOffset
+    const timezoneOffset = 5 * 60 * 60 * 1000 // 5 hours
+    return new Date(timestamp + 'Z').getTime() + timezoneOffset
   }
 
   private async fetchAsset (symbol: string, authToken: string): Promise<AssetPrice> {