Time Conversion Table
Local Time
GMT or UTC or Zulu Time
Note: The times displayed above use the clock on your PC.
UTC or Zulu Time
Pacific Daylight Time
24 hour clock PDT
 
UTC or Zulu Time
Pacific Standard Time
24 hour clock PST
00Z
5 PM
1700
00Z
4 PM
1600
01Z
6 PM
1800
01Z
5 PM
1700
02Z
7 PM
1900
02Z
6 PM
1800
03Z
8 PM
2000
03Z
7 PM
1900
04Z
9 PM
2100
04Z
8 PM
2000
05Z
10 PM
2200
05Z
9 PM
2100
06Z
11 PM
2300
06Z
10 PM
2200
07Z
12 AM
0000
07Z
11 PM
2300
08Z
1 AM
0100
08Z
12 AM
0000
09Z
2 AM
0200
09Z
1 AM
0100
10Z
3 AM
0300
10Z
2 AM
0200
11Z
4 AM
0400
11Z
3 AM
0300
12Z
5 AM
0500
12Z
4 AM
0400
13Z
6 AM
0600
13Z
5 AM
0500
14Z
7 AM
0700
14Z
6 AM
0600
15Z
8 AM
0800
15Z
7 AM
0700
16Z
9 AM
0900
16Z
8 AM
0800
17Z
10 AM
1000
17Z
9 AM
0900
18Z
11 AM
1100
18Z
10 AM
1000
19Z
12 PM
1200
19Z
11 AM
1100
20Z
1 PM
1300
20Z
12 PM
1200
21Z
2 PM
1400
21Z
1 PM
1300
22Z
3 PM
1500
22Z
2 PM
1400
23Z
4 PM
1600
23Z
3 PM
1500

To convert Universal Time Coordinate (UTC) to local time (LT), subtract 7 hours during
Daylight Saving Time (DST). Daylight Saving Time, starts on the second Sunday of March and continues
until the first Sunday of November in the United States. During Pacific Standard Time (PST), subtract 8 hours.
If the UTC is less than 7 during PDT or less than 8 during PST, add the difference to 24 to get the local time.

For example, if the UTC is 0500, local time is 9PM PST

5 UTC - 8 = -3
-3  + 24 =  21
21 -12 = 9 PM PST.

During Daylight Saving Time (DST) it would be 10PM PDT.

5 - 7 = -2
-2  + 24 = 22
22 - 12 = 10 PM PDT.

If the difference is 0, it's midnight local time.

If know your approximate longitude, subtract 1 hour for every 15 degrees of longitude

Assuming the earth is a perfect sphere, it takes about 24 hrs to complete one revolution
  360 degrees / 24hr = 15 degrees/hr

So if it's 2100 UTC and your 120 degrees longitude from the prime meridian (0 degree longitude),

120 degrees / 15 degrees per hour = 8 hours