Conversions


Convert to and from standard time and different types of decimal time.

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Standard Time:
Excel for Windows:
Excel for Macintosh:
IAU:
Two-line Element epoch:
Julian Date:
Modified Julian Date:
French Republican (local):
French Republican (Paris):
Swatch @Time:
Unix Time:
STO Stardate:
TG Stardate:


Time Intervals

Decimal to Standard
1.0 d =  24 h 0 m 0 s
0.1 d =  2 h 24 m 0 s
0.01 d =  14 m 24 s
0.001 d =  1 m 26.4 s
0.0001 d =  8.64 s
0.00001 d =  864 ms
0.000001 d =  86.4 ms
Standard to Decimal
24 h =  1.0 d
1 h =  0.0416 d
30 m =  0.02083 d
15 m =  0.010416 d
5 m =  0.003472 d
1 m =  0.000694 d
1 s =  0.0000115740 d

Fractional Day to 24-Hour Time

0.0 = 00:00
0.1 = 02:24
0.2 = 04:48
0.3 = 07:12
0.4 = 09:36
0.5 = 12:00
0.6 = 14:24
0.7 = 16:48
0.8 = 19:12
0.9 = 21:36
1.0 = 24:00

24-Hour Time to Fractional Day

00:00 = 0.0
01:00 = 0.0416
02:00 = 0.083
03:00 = 0.125
04:00 = 0.166
05:00 = 0.2083
06:00 = 0.25
07:00 = 0.2916
08:00 = 0.33
09:00 = 0.375
10:00 = 0.416
11:00 = 0.4583
12:00 = 0.5
13:00 = 0.5416
14:00 = 0.583
15:00 = 0.625
16:00 = 0.666
17:00 = 0.7083
18:00 = 0.75
19:00 = 0.7916
20:00 = 0.83
21:00 = 0.875
22:00 = 0.916
23:00 = 0.9583
24:00 = 1.0